The One With the Sharks - S9-E4
Revealing mistake: While Monica and Rachel are talking about Chandler's "jollies to Jaws" Rachel's wearing a colorful flowery top, and after Joey walks in just as Monica takes her seat at the table in the closeup, it's Jennifer Aniston's stand-in, wearing a blue top, who is seated beside Monica. Rachel's hair is wavy in the flowered top, but straight in the blue top (viewed in widescreen). (00:12:22)
Visible crew/equipment: When the son of the accident victims is being led through the trauma rooms to see his parents' bodies, you can see Laura Innes crouching under a table in the background directing the scene. Innes was the director of this episode and it was established that this episode took place on her character's day off. Therefore, she should not have appeared in front of the camera at all. (00:32:30)
Six Forgotten Warriors Chapter 4: The Six Fight Again - S5-E5
Other mistake: The news footage of the elderly Six American Heroes being attacked by the Insidious Six is merely clips from the previous episode.
Continuity mistake: When the MODOK E.L.F. is in the fish tank watching Rhodey at his computer, it is located at the bottom of the tank near the sidewall on its right. When the shot changes to over Rhodey's shoulder, the MODOK E.L.F. is now at the top-center area of the tank. (00:05:50)
The Origin of the Fantastic Four: Part 1 - S1-E1
Continuity mistake: When Thing first walks into Puppet Master's house, the doors are gray. When the shot changes, the doors are blue. (00:17:00)