The One With The Mugging - S9-E15
Revealing mistake: When Rachel tells Joey that his agent called and he got the audition for the Broadway play, Rachel's wearing a colorful paisley top, and after Monica says, "Maybe the monkey will be at the audition," in the next shot it's Jennifer Aniston's stand-in, wearing a red plaid blouse, who is standing beside Joey. (Widescreen). (00:03:08)
The One With The Mugging - S9-E15
Continuity mistake: When Phoebe and Ross are 'mugged' it is dark and in the evening. However, when Ross tells Monica what had 'just' happens you can see that it is the middle of the day. (00:07:45)
The One With The Mugging - S9-E15
Visible crew/equipment: Just before Ross and Phoebe walk into Central Perk after being mugged, as it shows the window from the outside you can see a stage light between the blinds. (00:10:35)
The One With The Mugging - S9-E15
Continuity mistake: When Rachel is asking Joey what he's doing with all the liquid, her drink changes places depending on the shots. (00:14:50)
The One With The Mugging - S9-E15
Continuity mistake: When Joey goes to Monica and Chandler's apartment, he goes to the fridge to get something to drink to keep his bladder full for the audition. When he closes the fridge he has two bottles in his left hand. The camera cuts to Monica, then cuts back to Joey. He then has two cans in his left hand and is holding them differently. (00:14:55)
The One With The Mugging - S9-E15
Continuity mistake: When Chandler, Rachel and Monica are discussing the sneakers, Rachel is holding a water bottle. In a close up shot it has the cap on it, in the next far shot it is on the table without a cap. (00:15:30)
The One With The Mugging - S9-E15
Continuity mistake: When Phoebe is talking to Ross about mugging her and he is reading the paper, it changes several times from being folded over to regular size to being folded over again. (00:19:00)
The One With The Mugging - S9-E15
Continuity mistake: In The One With The Mugging, Phoebe brings her 'crap from the street' box to the coffee shop to show Ross, and she opens the flaps of the box twice. (00:19:15)
The One With The Mugging - S9-E15
Visible crew/equipment: When Chandler first walks into the conference room at work, and also later when he walks out of the conference room while using a cane, the end of the set wall can be seen at the left side of the screen.
The One With The Mugging - S9-E15
Visible crew/equipment: When Ross walks into Central Perk and Phoebe asks him about his class before she tells him the truth, in the closeup of Ross the camera can be seen at the right side of the screen.
The One With The Mugging - S9-E15
Visible crew/equipment: When Chandler slips while wearing the shoes, if you look above Monica and Rachel, you will see a stage light.
The One With The Boob Job - S9-E16
Continuity mistake: When Mike goes to leave Phoebe's apartment at the start, he puts his jacket over his arm twice. (00:02:10)
The One With The Boob Job - S9-E16
Revealing mistake: When Phoebe and Mike walk into Central Perk and announce they're moving in together, Chandler, Monica, and Ross, who's wearing a sweatshirt and khakis, are all sitting on the couch, and after Phoebe's comment about loading up the Volvo and wanting to be a soccer mom, it's David Schwimmer's stand-in, wearing a blue button-down shirt and jeans, who is seated beside Chandler.
The One With The Memorial Service - S9-E17
Continuity mistake: After Phoebe kisses Mike in her apartment, Mikes friend rushes in and discovers them. As soon as the shot widens, Mike's hand moves from being behind Phoebes head to his lap. (00:17:35)
The One With The Memorial Service - S9-E17
Continuity mistake: In the beginning when Joey tries to spin the ball with his finger, it falls, hits the table and bounces to the background. In the very next shot it is seen falling behind Chandler on the couch.
The One With The Lottery - S9-E18
Visible crew/equipment: At the start when they have the tickets and the empty bowl, you can see some of the stage lights in the bowl's reflection. (00:02:00)
The One With The Lottery - S9-E18
Continuity mistake: In The One With The Lottery, Chandler is on the phone to find out if he got the job, he then hangs up and rolls up one of his sleeves. In the next shot of him both sleeves are rolled up. Then you can see his sleeves slip down again, but when it cuts to a closer shot, you can see they're rolled up again. (00:04:40)
The One With The Lottery - S9-E18
Continuity mistake: In the scene where Joey and Phoebe are holding the lucky bone, which they have to break and make a wish, look at Joey's thumb; the location of it changes between shots. (00:05:40)
The One With The Lottery - S9-E18
Continuity mistake: In TOW the lottery tickets series 9 just after Chandler has got the job and he sits down you can see Joey's hand in the right side of the screen however when the shot changes Joey moves his hands up to the position we have just seen. The shot changes back and his hand is in the same position. (00:18:50)
The One With The Lottery - S9-E18
Continuity mistake: After he gets the job Chandler sits on the couch pretending to read a magazine and Joey drops a piece of paper that materialises in his right hand in between shots. (00:19:40)
Answer: Usually by the seventh night of Hanukkah you don't know what to get the other person, and you will probably resort to getting the other person something insignificant. Chandler is basically saying that the pen is a stupid gift.