Shouldn't be a surprise. TAB, even stuff in standard notation is often full of inaccuracies - it's always been that way.
It's not like Hal Leonard has a full-time staff of crack transcriptionists. As far as I know, anyone can transcribe anything and then cut a deal with ol' Hal. And do you think HL has paid staff that check all their transcriptions for accuracy? Doubtful....
Another reason to transcribe the material yourself. :AOK
I'm not claiming the playing (or the scrolling tab at the bottom of the screen) are flawless, but you can watch it quickly and get a good feel for how these songs are played. I find the tab almost worthless, because it scrolls as fast as the playing, and it is a hassle to constantly stop and freeze each new screen of tab, read it, and then resume the playing.
I generally just watch Doug Boduch's playing.
I think there is a companion book featuring full printed out tabs and backing tracks:
Basically, Hal Leonard has a long running guitar play-along series, featuring printed tabs and the songs on CD (full version and full version minus main guitar part). This is the guitar play-along CD series. (These are not the most accurate tabs, but they are serviceable and, hopefully, match the playing on the performance tracks.)
Now they have a guitar play-along DVD series as well. You can actually turn the guitar off if you want to play along w/ the DVD. At present, there aren't many in the guitar play-along DVD series. Here is a list: