On the Scooby-Doo! Mystery Incorporated: Season 2, Volume 1: A Danger in the Deep DVD, a production sheet flashes on screen for a millisecond at the very end of "Night Terrors" between the final scene and the credits. It may have to do with WB not encoding it onto the disc right, as trying to rewind once you pause it at that point causes it to jump to the end of the previous disc chapter (the scene mid-episode where Shaggy and Daphne are kissing). The sheet gives a production code of #345-810, a string of numbers and letters (2002Ft 09 32041F), and the date this episode was completed, December 19, 2011. This episode aired on Cartoon Network in the United States August 10, 2012, which gives us a general sense of how long these episodes are produced before they air.
My apologies for posting the fun fact so late today (5:00pm). It ended up being quite a busy day, and I knew this would take a while to do because of the picture (in hindsight, I should have just written it in advance). When I said it pops up for a millisecond, I mean literally a millisecond...so it took me like 20 minutes just to get this picture because I kept barely missing it and had to keep rewinding lol. Anyway, hopefully even though this wasn't posted at the regular time, maybe it can still brighten your morning on Tuesday!