Something I never understood...
I think it was either late season 1 or sometime through season 2 Hank put a tracker under Walt's car and it was never mentioned again or explained why. It was like it never happened (plot hole). Only thing I could think of was they were planning to end the show earlier with Hank finding out about Walt sooner but instead decided to keep the story going and forget about it. Maybe there was something I missed?
Plum near cut his head in two mmmmm hmmmmm