Visible crew/equipment: The scene where Spencer throws the boomerang for the first time and misses the bikers they take off running. While they are running from the bikers, there is a shot right before the boomerang hits the bikers where you can see a camera man sitting in the bushes on the left side. You don't have to pause it, but can to see it better. (00:36:30)
Continuity mistake: When Frankie is fighting Mitch and gets thrown off the balcony the diaper bin on his head comes off, but in the next shot when he lands in the pool it's back on his head.
Continuity mistake: When the moms are making gingerbread houses the candies on the houses change with each shot.
Factual error: Jack Sparrow says he loves the French because "they invented mayonnaise." The film is set in the 1750s. The egg-based sauce known as mayonnaise was developed in the early 1800s. The Oxford English Dictionary says the word dates from 1815.
Factual error: The action takes place around the second half of June (either side of the Glastonbury festival weekend). At the beginning of the film leaving work early evening in time to get home for dinner, in the UK, it wouldn't be dark. Later on, there isn't that much snow in the Alps, especially below the tree line, at that time of year.
Continuity mistake: When Mildred and her son pull up in the station wagon, there is a drink thrown at the car that hits the windshield. She gets out and confronts them, and then walks back to her car, with no evidence of anything having hit the windshield. It would be running down the glass and was a pretty thick substance. (00:59:00)
Character mistake: When they are having the going away party for Paul, "leisure" is spelled wrong on the cake.
Continuity mistake: When they jump in the pool, they drop the guitar. When they jump out their guitar is no longer in the pool.
Audio problem: When Rob starts accusing Benny of knowing what happened to him the previous night, Benny says that they just hung out and Rob says "Shut yo ass up" to Benny. The shot is focusing on Benny, with the camera behind Rob and his jaw does not move when he is saying the line. (00:56:20)
Factual error: The tubing scene was filmed at Nashoba Valley in Westford, MA. The scene looking down from the top of the tubing run has a banner with the name of the ski area and the "mountains" in the background scene are photoshopped in.
Continuity mistake: During the drunken gymnastics young Miss Langford is doing to the delight of the paparazzi, she is wearing transparent pantyhose for the most part of the scene; you can see it during the cartwheels with the panty shot, and with the feet close-up. However her legs and feet are bare when the camera shows a stuntwoman leaping over the gifts and crashing into the tree (probably they didn't want to tear the stockings with that landing). (00:02:30 - 00:03:55)