Other mistake: When Darth Maul is fighting with Qui-Gon for the first time on Tatooine, Darth Maul's first saber strike actually hits Qui-Gon's hands and saber hilt, not the blade.
Continuity mistake: When Captain Tarpals gives Jar Jar a zap with his power pole, the fish and the appearance, size and position of some of the bubble building outside the membrane change between shots. (01:14:05)
Audio problem: When Obi-Wan checks Anakin's midi-chlorian count, he says that he has a count of over "twenty thousand", but the movement of his lips indicates that he's saying "ten thousand". (00:48:45)
Other mistake: When Darth Maul and Qui-Gon are fighting in the corridor filled with rays, when Maul spins around in the beginning of the second shot, half of his lightsaber disappears for a few frames. (01:51:25)
Continuity mistake: When Qui-Gon and Watto are talking in the hangar before the Podrace, Qui-Gon says "You don't think the boy can win?". You can see Watto's waist strap disappear into him. (00:52:30)
Continuity mistake: When Anakin is packing his backpack while speaking to C3PO, there is a toy on his bed like a Naboo fighter. In the next shot, it changes place and orientation. (01:14:30)
Revealing mistake: After the final battle scene when the Jedi council come down to the Naboo city, as they are leaving the spacecraft there is a figure in the background who is obviously supposed to be Mace Windu, but is definitely not Samuel L. Jackson. The man is African-American, bald and dressed in Windu's clothes, but is not him. Perhaps Mr. Jackson was unavailable that day. (02:00:50)
Suggested correction: There is no indication that this man is "supposed to be" Mace Windu. First, several adult Jedi wear similar clothes. Second, during the funeral service for Qui-Gon, there are two rows of people sitting in a large, round room. We don't see all of them on screen. No reason why another human Jedi, who looks similar to Windu, could not be there.
Continuity mistake: When Padme is cleaning R2D2 and chatting to Jar-Jar, the film's reversed in the final shot of Natalie Portman smiling. The easiest way to notice it is that when we're looking at R2D2, normally his lens is to the right of a blue/red light, but in the final shot the lens is now to the left of that light. (00:27:57)
Continuity mistake: When Obi Wan is fighting with Darth Maul, Maul knocks Obi Wan back into the reactor pit using the force. When they first show Maul's hand, it is his right hand that takes off the lightsaber and pushes Obi Wan back. When the camera angle changes to show Obi Wan rolling backwards into the pit, Maul's left hand is clearly shown raised.
Revealing mistake: When Qui-Gon and Obi-Wan are being gassed, Nute Gunray's hologram says, "Destroy what's left of them." After he says this, watch the battle droid on the left side of the screen closest to the hologram. One of its fingers goes through the barrel of the gun it's holding. (00:05:15)
Continuity mistake: As Obi-Wan is looking up at Darth Maul and Qui-Gon, they are fighting in the middle of the walkway. When Obi-Wan jumps up, they are at the doorway at the end of the walkway. They couldn't have reached the end of the walkway that quickly. (01:51:50)
Visible crew/equipment: In the Boardroom in Otoh Gunga, as Obi-Wan and Qui-Gon turn to leave, you can see Obi-Wan's lapel mic just inside his tunic.
Continuity mistake: After Darth Maul falls off the walkway, Qui-Gon jumps down after him, and there are several vertical beams behind them. In the next shot, they have suddenly moved past them, but in the following shot, they are fighting in front of the beams again. (01:51:05)
Continuity mistake: After Darth Maul sits down in his speeder, the probe droid flies past him, but in the previous shot, it was nowhere to be seen. It should have been visible, because of its position and the direction it was coming from. (01:13:35)
Continuity mistake: After Obi-Wan falls off the walkway, he manages to grab hold of the edge of another walkway, and on the floor, there's a lit strip near his hands, to his right. When Qui-Gon and Darth Maul continue the fight, there's a wideshot where Obi-Wan (still hanging from the edge of the walkway) can be seen in the lower left hand corner of the screen. His hands are now further away from the strip, and are closer to the strip on his left. (01:50:50)
Continuity mistake: When Anakin says goodbye to his mother, his shirt collar keeps moving up and down his neck between shots. The easiest way to see this is to watch his necklace, which is more covered up by his shirt in some shots than others. (01:11:45)
Revealing mistake: During the race, Anakin's clothes don't move in some shots, even though he's going at an extremely high speed.
Continuity mistake: When Qui-Gon is fighting Darth Maul on Tatooine, Obi-Wan sits down in the cockpit of Amidala's starship. As the shot ends, his hand is up by the top of Ric Olié's (the pilot) seat. In the beginning of the next shot, his hand is down by his side, and Anakin's hand has suddenly appeared on top of the seat. (01:14:00)
Continuity mistake: In Otoh Gunga (the Gungan city), when Captain Tarpals comes to arrest Jar Jar, the background in the shots of Obi-Wan and Jar Jar doesn't match the background in the previous and following shots. (00:13:50)
Revealing mistake: When the Queen is escorted down the stairs in the Theed Royal Palace, right before Nute Gunray says, "Process them.", watch the space between Sabé (the Queen's decoy) and Captain Panaka, before a handmaiden and one of the Queen's guards block the view; the battle droid behind Sabé doesn't cast a shadow on the railing, as everyone else does in this shot. (00:21:00)