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)
Partners in Danger Chapter 4: Return of Kraven - S4-E4
Continuity mistake: When Kraven is climbing the cage, it briefly changes color from silver to red.
Rejoice! I Am Ultimo Thy Deliverer - S1-E2
Continuity mistake: When Tony and Rhodey are first shown walking into the yacht's surveillance area, Rhodey is wearing white shoes. In the next shot, his shoes are black.
The Origin of the Fantastic Four: Part 1 - S1-E1
Continuity mistake: When Dick Clark walks back over to his desk after giving instructions to the camera operators, Sue is shown sitting equidistant between Johnny and Reed. When the shot changes, she is suddenly sitting closer to Reed, and Johnny is nowhere to be seen. Reed also suddenly has blonde hair. (00:15:03)