Friends fans notice a huge mistake in season 8

On Moments As TikTok user @bronniieee pointed out, the episode "The One in Massapequa," which originally aired in 2002, had a rather glaring error.

In the season eight episode, Monica and Ross' parents, Jack and Judy Gellar, throw a party to commemorate their 35th wedding anniversary. During the celebration, Jack and Judy (played by Elliot Gould and Christina Pickles respectively) reveal that they have told party regulars Ross (David Schwimmer) and Rachel ( Jennifer Aniston) got married and asked them to accept the lie.

In one scene, the camera pans to Ross and Rachel, revealing a completely different actor playing the role of Jack, who bears little resemblance to Gould.

"In all my years of being a Friends fan, how come I have never noticed this guy before," the caption for the viral clip reads. One user also commented: "I watched the episode this morning and didn't catch this." Another user pointed out that the replacement actors were similar to those from Schitt Creek . Eugene Levy.

Jennifer Aniston and David Schwimmer in Friends . Warner Bros./"Friends"

There is a simple explanation

While many fans were confused by the error, others on TikTok pointed out that it's common for stuntmen to deliver lines or react when one of the show's lead actors isn't on set.

"When the show originally aired, the stunt would have been taken out of the shot," one fan commented, referring to changes in television technical standards since the show originally aired. "The old TV format was 4:3 aspect ratio," added another. "When TVs go to 16:9 widescreen, we see things we shouldn't see."

This question comes up many times in the show. On Reddit, people discovered a similar "obviously obvious mistake" in Season 8's "My Date with Rachel," where Monica was suddenly double-doubled while talking to Phoebe (Lisa Kudrow) Actors replaced, and in the Season 9 episode "Rachel's Date," Monica was suddenly replaced by a stuntman. "Mugger," Rachel was replaced by someone wearing different clothes.