Among the things you'd see if you watched that is that when push comes to shove, Paul & I use a mishmash of whatever resources are at hand to get the job done. Some OD&D, B/X, and AD&D books get involved. We use Matt Finch's Tome of Adventure Design to get some initial ideas flowing. Plus a couple of custom resources via OED Games, of course.
One such resource is the OED Monster Determination charts, which gets used as drop-in for OD&D monster tables. That's something that compiles monsters from later D&D products (i.e., original D&D Supplement I: Greyhawk by Gygax and Supplement II: Blackmoor by Arneson), and also gives me a lot more confidence in the relative danger levels, because they've been assessed by a few billion computer-simulated melees (see more detail in that linked page).
Note that we only got our dungeon about half-stocked in the hour, with our special DM-designed tentpole areas, and one or two random monsters to boot. (Arguably the delay was me being my usual chatty self.) As we talked about finishing the rest in a future episode, likely with some tricks and traps, the question was posed how we flesh out those pieces.
Here's the answer: I have another custom batch of tables called the OED Traps Digest that I've used behind-the-scenes for about 8 years now. One of the things that frustrated me a bit with classic D&D is that there's plenty of mentions in the books, tables even, for what kind of traps could be included -- but with just a few exceptions, no mechanical stats for those traps!
So the Traps Digest gives me a set of tables -- again, in a format that drops into the same OD&D system for determining monster levels -- from which I can either tastefully select or randomly roll, depending on the situation. And there are short "stat blocks" that I can copy-paste into adventure and not distract myself from writing the high-level content I'm rolling out for a dungeon area. Is it perfect? Probably not, but it's definitely saved me time and focus.
Since viewers kindly asked about it, here it is. What do you think -- and what edits would you suggest? Tune in and see what comes from this the next time we do a Dungeon Design Dash episode. :-)