Andy is leaving for college in a matter of days, which indicates it is late summer or early fall. But when he visits Bonnie's house, it's covered with wisteria, which blooms in May.
I haven't seen the movie yet, but since this is animated this may or may not be a slip-up.
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Gamechaser001 writes:
It would depend on the college Andy was going to (which I don't remember them mentioning in the movie), many colleges have a spring/summer quarter, so it can make perfect sense for Andy to be starting college in late spring or early summer, not a slip up