What's the proper workflow to combine multiple video types and turn them into one high quality DVD?

Question

I'm trying to combine 1080i (29.97fps), 1080p (29.97fps), and 720p (24fps) video files into a single Premiere Pro project, and end up with a high quality DVD.
There are a few problems I can't solve:
1. There seems to be interlacing and clarity issues any time I export it to DVD dimensions (720x480), and on some TVs I'll get a bouncing motion on the 720p footage (slideshow). Yet everything seems to look perfect when I export it something like an HD MOV file.
2. If I use Final Cut X to make the DVD, I'll get audio popping and decent image quality. Yet if I use Encore, I'll get horrible interlacing, but good audio.
I don't have any training in video workflow let alone how to properly diagnose and solve problems that arise. So I need someone to lay out the proper workflow and settings from start to finish to get these three different types of footage to look great on a DVD using Premiere/Encore.
I've attached sample images showing the types of footage I'm using and the kind of problems I'm running into for reference.

Answer 1

By far the best way to get the quality of encoding is to use Compressor and not DVDSP. You can set Compressor up to do the AC3 (which DVDSP can't do). Alternatively, use a better encoder than Compressor, such as BitVice or MegaPEG.X... but remember that these do not do AC3 encoding.
Keep the encoded assets all in a single folder on your mac, then drag that folder into the DVDSP 'Assets' tab. This will import them all and keep them in the folder, which is a neater way of doing things. Select all of the clips within the folder (or simply select the folder itself) and drag them on to the track - they will go on in alphabetic or numeric order (whichever you have used as your names). If using numbers, remember to use '01', '02', etc otherwise clip ten, eleven, twelve and so on will follow clip one... clip two will come after clip 19.
Drop them all on a single track. You can then point a menu button at the track and all of the clips will play one after the other. If you want black in between then you will be better adding this in a NLE such as Final Cut, then exporting the entire sequence of clips as a single file. Alternatively, create a black .pict file the correct dimensions for the video format you are using and manually add it in between each clip on the timeline. Or, create a series of black .pict files and name them 011, 021, 031 and so on. Place them in your folder of clips with the MPEGs named 01, 02 and so on. When you select all and drop it onto your timeline within DVDSP a black clip will go in between each piece of footage (sequence will be 01, 011, 02, 021, 03, 031 ). This is probably the quickest way to do it. You can reuse the same black .pict files for every project like this and as long as you follow the same naming convention it will always work.
Like anything you want to automate, the first couple of times take longer to set up. After that it is a lot easier.