I have a couple more suggestions for you..
Just past Poor David's Pub there is a pay parking lot that is small. If you get there early enough to park there you will get out of the venue quickly afterwards. I don't think it gets much business after a concert because it is directly opposite the Dallas Police Department.
I personally am going to take a cab back to the MidCities. I don't like to have to worry about driving after.
Once you get inside the venue, you should head to the right. The left side of the stage at the Palladium is usually really packed, but the right side seems be a little less crowded and there is a bar close at hand. Only bad part is that puts you on the other side of the building from the head.
You need to brush up on your Toadies lyrics. These concerts are a BIG sing along and if you want to participate in the fun, you should remember the words to at least PK and Tyler.
I went to about a dozen different concerts last year and I would have to say that The Toadies was the best by far. You should have a blast!