Okay, when the gang are watching the Prom Video, the TV screen goes black right after Judy stops filming. For a split second the camera focuses on the black TV screen, and in it, you can see the reflection of the bright studio lights!!
What do you expect!! They are in a film studio for goodness sake, you want them to turn all the lights off, just so we don't see a reflection? Get real.
Well that was unnecessarily snappish. Obviously the show was filmed in a television studio; everyone knows that. The point is, viewers of TV shows are *not supposed* to see cameras, studio lights, microphones, or any other apparatus used to make the show...It kind of deflates the whole suspension of disbelief. Therefore, it IS a slipup. We weren't supposed to see any studio lights.
Lajaz, what's the point in looking up a 'SLIP-UP' site if you think that something like this is overly finicky? Of course it is, most of the stuff we put on here is finicky!! Keep 'em coming, Manwithnolife.
There's another slip-up in that reflection...as the screen goes dark on the TV, you can see Monica's reflection as she stands up from the chair - they immediately switch to her and she's sitting, and then stands up again.