Answer: The wrong detail is the calendar on the table, June only has 30 days.
Ah, you're pointing out an inconsistency with a calendar detail! If the calendar on the table shows June as having more than 30 days, that's incorrect, because June always has 30 days. Any depiction showing a June calendar with 31 days (or any other incorrect number of days) would be a mistake. This kind of error can sometimes appear in visual media or illustrations, where attention to detail may be overlooked.
Thanks for pointing that out!
