Continuity mistake: "Railway Station" (Adventure 2, Part 4): Steel's crooked bow tie straightens itself out between takes as he's confronting the soldier's ghost. (00:04:00)
Continuity mistake: When we see the pizza stand at the beginning, you can see there is nothing on the counter when the Mystery Machine drives past it. But when Scooby goes up to the stand, a plate of rolls and a napkin holder with two pots have appeared.