Trivia: After Phoebe arrives in her grandmother's taxi to pick everybody up, you can see that as the gang walks toward the car, the action is speeded up considerably. This may have been done to trim a few seconds, or perhaps because such an incidental scene just took too long to play out.
Trivia: This episode shows us an exception to a Friends' rule: Rachel is wearing a wide-brimmed hat that was a gift from one of the friends (Ross) that she didn't exchange.
Goof: When the gang first open the doors to the beach house and Phoebe turns on the light, there are huge damp patches in the sand. In the very next shot as they enter, however, the sand is virtually dry.
Goof: Rachel is painting Monica's nails when they are all bored. However, later in the scene when Monica touches the picture that Phoebe stole, her nails are not painted.
Note: If you look closely, you can see that Rachel is applying clear fingernail polish to Monica's nails, not colored. Moments later, when Rachel is tussling with Ross, he swipes the nail brush against her forehead and you can see there is no color on the brush.
Goof: When Phoebe goes to the other Phoebe's house, it's raining. But when Phoebe walks into the house her hair and clothes are dry.
Goof: When Phoebe goes to the other Phoebe's house right before she takes the photo off the fridge, the cookie jar has its lid off. The camera angle changes and the lid is on. Then after she has taken the photo off the fridge, the lid has come off the cookie jar.
Goof: When Bonnie first arrives at the beach house, the boom mic is seen at the top of the screen.
Goof: When Joey wakes up covered in sand, his "right boob" has a big crack. However when the camera angle changes, the crack is gone.
Goof: When Rachel is telling Ross that she is still in love with him, her hair keeps changing from behind her ear to down when the camera changes angles.
Goof: Near the end, when Joey is asking Ross if Bonnie's free tonight, he is pointing his hands at Ross. In the very next shot they are in his pockets.
Trivia: At the end of the episode, there is a slow piano version of the chorus of the Friends theme, "I'll Be There For You."
Trivia: Pete says of his injuries that he has a torn rotator cuff (shoulder), a hairline fracture in his right forearm and a severely-bruised Adam's apple. It seems that those would be the least of his injuries, given that he's wearing a full upper-body, double-arm cast and a neck brace.
Trivia: Chandler asks if there is a town somewhere called Sample so that when you enter it the sign says "You're in Sample". There are four towns called Sample in the United States, located in Colorado, Kentucky, Pennsylvania, and Texas.
Goof: Ross bought an Ultimate Fighting Combo, a large pop and popcorn, at the fight. However, after Ross and Monica sit down, they are never seen again. Furthermore, when Monica talks to Pete at the ring, you can see that the combo was not set on the floor.
Goof: When Chandler's boss is slapping all the guys on the butt, on the table closest to the camera there is a notepad with a pen on it. When the guy comes back in to get his briefcase, the pen is gone.
Factual Error: In the opening of the episode, Monica lists a number of tactics as legal in the UFC due to a lack of rules. Included are hair pulling and biting, both of which are in fact illegal in UFC matches. While biting has always been illegal in UFC matches, hair pulling was in fact legal in 1997, the date this show aired (of course, if hair-pulling was legal, how many UFC fighters would actually have hair you could pull?).
Factual Error: In 1997, the time the episode took place, New York had banned the UFC and MMA fights from taking place.
Goof: When Robin Williams and Billy Crystal are getting up and leaving Central Perk, Monica's purse goes from on her lap, to on her shoulder, and back to her lap.
Goof: In the scene with Robin Williams and Billy Crystal, there is a shot of Rachel with her hair is hanging straight down. When the camera angle changes there is a section of hair behind her ear. In the shot after that it is hanging straight, and is then behind her ears again.
Trivia: When the gang is in the coffee house, after the opening credits, Chandler is drinking a Yoohoo, which is seen in many episodes. When you look at the bottle, Yoohoo is spelled Yooh.