Just for the record, this is because they're last in-first out stacks, and people tend to add things to them in chronological order (either because they're compiling them over time as a series progresses, or after the fact because it seems logical). In order to get them to play with the earliest episode first, the person curating the playlist has to start adding with the newest one, or if compiling as the series is going, the curator has to remember to deliberately move each new entry to the bottom. Some do, most either forget or can't be arsed.

What really annoys me is that no one at Google can be bothered to add a "play this playlist in reverse order" button for the user, so that playlist curation errors of this kind can be worked around on the client side.

--G.
-><-
Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
Eyrie Productions, Unlimited http://www.eyrie-productions.com/
zgryphon at that email service Google has
Ceterum censeo Carthaginem esse delendam.