The Loud parents mistakenly drive to the high school for Lincoln's conference, even though they should have already been there because they had just finished Luna's conference.
During the twin's flashback, the date on the whiteboard is written as July 11, 2022. School should have been out by this point, since that date would fall during summer vacation.
During Lucy's flashback, the calendar says that thirty days are left until spring break. This date should not have happened yet, as it is also established that Lincoln's midterm essay is one day late.
While Lincoln's sisters are fighting, Lynn yells, "Pile-driver!" but performs an elbow drop instead of a pile-driver.
The Loud parents' chart states that Lucy attends the middle school even though she is actually in the fourth grade.