Other mistake: In the end credits, the pseudo-newspaper text surrounding James Marsden reads "The best man was Kevin Doyle's long-time friend and colleague, Trent, who has [James Marsden] The best man was Kevin Doyle's long-time friend and colleague, Trent, who has recently taken over." The part before the actor's name is repeated immediately after.
Other mistake: In the beginning of the movie when Mike Myers starts to play 9 to 5, the title comes on the screen. Beneath it it says: (R) MXVIII Paramount Pictures. It's actually supposed to say MMVIII as the movie was made in the year 2008 and not in year 1018. (00:04:40)
Other mistake: It makes no sense that the tartan that Collin's mother puts on the wedding dress does not match the tartan that Colin is wearing at the Highland Games. Clan tartans are a big deal in Scotland so this makes no sense.