The One Where Monica and Richard Are Just Friends - S3-E13
Factual error: Joey refers to several of his favorite parts of The Shining in 'code', including "all blank and no blank makes blank a blank blank, " which obviously refers to the "all work and no play makes Jack a dull boy" scene from the movie. However, that scene (and the one where Danny sees the two "blanks" in the hallway) is not found in the book; only in the movie. (00:13:55)
Suggested correction: I know they're talking about the book, but doesn't it actually make sense for Joey to be referencing the movie, even though the conversation is about the book? Considering the character, I don't think that's off at all. He's read the book, but he's obviously seen the movie, too.
Later in that scene, Ross references The Shining as a book Joey loves that stars Jack Nicholson. Therefore, it's safe to assume that Joey has seen the movie and the audience could infer that he may confuse the two often enough for Ross to reference it that way. This might just be another Joey mistake (which he has many) vs a factual error of the show.
The One Where Monica and Richard Are Just Friends - S3-E13
Continuity mistake: When Richard sits in Monica's room, when Monica opens the door we can see in the background the living room's window draperies, table, picture frame, etc., but they're not as they should be. In this mock-up the shade is pulled down, the draperies look different, and the direction they're all facing differs. (00:15:55)
The One Where Monica and Richard Are Just Friends - S3-E13
Continuity mistake: Monica and Richard are squishing tomatoes; when she starts dabbing his shirt with club soda the door behind them leading to Monica's room goes from open to shut between two shots. (00:08:30)
The One Where Monica and Richard Are Just Friends - S3-E13
Revealing mistake: When Richard gets tomato juice on his shirt and Monica goes to get some soda for it, you can't see any juice on his shirt. (00:08:25)
The One Where Monica and Richard Are Just Friends - S3-E13
Continuity mistake: When Monica is in Richard's room she lights candles then realises Richard's home with another woman so blows out the candles but misses one. Next she hides under the duvet waiting for Richard. When he comes in all candles are unlit but she is still under the bed. (00:18:00)
The One Where Monica and Richard Are Just Friends - S3-E13
Revealing mistake: When they are in the coffee house and go over to the counter to discuss Phoebe's boyfriend's exposure out of his shorts, in the long shots you can see behind that there is no way they would be able to see anything.
The One Where Monica and Richard Are Just Friends - S3-E13
Continuity mistake: When Monica is dabbing Richard's shirt, the way she is holding the cloth changes between shots. Note the amount over her fingers. (00:08:50)