24p DVD mastering.
First some basics, there is no true 24p mode on standard DVD, there are is only 60i encoding (and 50i for PAL.) So all those film source are encode to DVD by adding 3:2 pulldown (or 2:2 for PAL with a 4% speed up for 24p sources.) How this pulldown is added impacts how well your DVD presents on today's common progressive displays.
The advantage of pulldown that uses the MPEG2's repeat flags, this can help with quality as only fields used to construct the 24p signal are compressed, the repeat flag pad the data out to 60i. This flags also help progressive scan DVD players reconstruct the correct 24p signal more reliably. The manually created pulldown in AE works for most situations as many DVD players can use the data-rate pattern to guess the pulldown, but it is not always extracted correctly (seen as a weave pattern during motion.) Of course there is no issue for non-progressive outputs where the display is reasonable for pulldown detection (if needed.)
The way I produced several 24p DVDs in the last weeks is to export out of Premiere as a 1920×1080 24p (23.976) master CineForm AVI, then I used VirtualDub and scale using Lanzcos 3 filter to 720×480 and export out to CineForm 444 SD. Load the SD clip back into Premiere SD 24p preset, interpret footage back to 16×9, and export with Adobe Media Encoder to MPEG2-DVD 24p. Encore will take this file without further transcoding. Now that seems to be an odd path and it is, plus using VirtualDub is unnecessary, but the export to 1920x1080 master first is a very important step.