Other mistake: Garry and Wyatt are sitting on the side of a 'planter box prop' that was built for the movie, not a bench, when Ian and Max spill the Icee (slush) on them. (00:32:52)
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Suggested correction: This isn't a mistake. Regardless of the fact it might have been built for the film, malls regularly have planter boxes that people can sit on (I've done it myself). Nothing in the film suggests they were sitting on a bench.
