Other mistake: At the beginning of the thrill race, Judy announces that it is Tuesday, July 7th. If July 7th was on a Tuesday, August 4th (the day Rocky performs in the circus) would also be on a Tuesday. However, the fact that Judy and Stink went to a bigfoot meeting (and then had a stake out) the day before they chased bigfoot, found Mr. Todd, and went to the circus suggests that August 4th was actually a Wednesday, not a Tuesday, because Zeke says at the beginning that bigfoot meetings are on Tuesdays.
Other mistake: At the beginning of the trip we see close-ups of the passports of the three girls being stamped. The date is 19 Jun 2010. During the climax of the movie Emma's boyfriend puts a copy of "Le Parisien" on the counter, and the date there is Jun 10 2010. (00:12:00 - 01:26:20)