canon shmanon. there's stuff i omit from my personal continuity, like TATV, Threshold, Spock's Brain and Way to Eden...but i also add in books and my own fan-fic...
Nope. If it makes it onscreen, it should be canon -- although I certainly understand the temptation to create one's own personal "canon".
But, I don't even like it when producers, writers and actors say..."Well, that one didn't count because I didn't like this or that about it".
Bullshit! You wrote it, acted in it, produced it and broadcast it. It's yours!
You own it now buddy. Don't give me this "I take it back" crap!
If my eyeballs beheld it and it was recorded in my ganglia (or "gangula" as McCoy said in the wonderful and epic "Spock's Brain") and auditory nerves, then it's part of the canon.