Those glitches are probably related to your overall bitrate. The DVD spec can only handle roughly 9.8 mb/s. The first thing to ask is how long is your program? This will affect how low or high you can go with the bitrate because you have limited space on a disc. The second question is – did you use AC3 audio? AC3 has a much lower bitrate than AIF saving you loads of bandwidth withing that 9.8 mb/s spectrum.
You can adjust your bitrate in Compressor in the Inspector