Continuity mistake: When Maze says goodbye to Lucifer and takes off on her motorcycle, the cars around change. You can see 2 cars parked with a car next to it with its blinker on. Then there are 3 parked cars and the end one has its hatchback up. Then as she drives off, it's a van. In the next shot the van and hatchback are gone.
Continuity mistake: The squiggle that Lucifer draws over "Become God" on his checklist changes between shots.
Answer: Boo Normal and Once Upon a Time were going to be part of season 4, then the show got cancelled (before being picked up elsewhere). As such they were added on to the end of season three as "bonus" episodes, hence the continuity being off. But not really a mistake, just a quirk of broadcasting. Boo Normal was originally going to be between the episodes "High School Poppycock" and "Infernal Guinea Pig" in season 3 before being slated for season 4, presumably because aside from the point you've raised, it was fairly flexible, continuity-wise.
Jon Sandys ★