Zeppster said:
Here's some from TOS
The year is the obvious one. There are several shows where it disputes the year. Squire of Gothos says it was 800 years after the French Napoleon era which would be the 26th century I think. Space Seed says it's only been 200 years since the 1990s which you can say okay it's 250 maybe, so that's just a minor one. Changling says it's 300 years. There's more that probably mess up but that's off the top of my head.
Spock talks about his mother as in past tense in 2 episodes(Corbomite Menuever and The Naked Time), but they are alive in Journey to Babel. Also how would Kirk not know who his first officer's parents were. Especially when Sarek is presented as important as he is and he is married with a human. It didn't seem that Vulcans and humans were married a lot from anything else. I just find is strange that Kirk having served with Spock for years(according to Amok Time) didn't know who Spock's parents were.
TWOK-How did Khan recognize Chekov when he wasn't on the Enterprise when Khan was.
Oh, year wise the worst is
Who Mourns for Addonais where Apollo states "It's been 5000 years..." since ancient Greek civiliation goes back to 750 BC or so. Thus this places
Star Trek in the 40th century or so.
Then there's the TMP 'Vulcan planet surface shot that SHOWS a moon, when in the TV series Spock says, "Vulcan has no moon."
From
Immunity Syndrome Spock states that "Vulcan has not been conquered in its collective memory - therefore no Vulcan can concieve of a conquerer..."
Yet (and I can remember the line, but not the episode where it came from) - Bones offers Spock a drink and Spock declines saying that Vulcans don't drink alohol; and McCoy responds with: "No wonder they were conquered."
Then, there is 'Nurse Chapel'(played by Majel Barret) in
The Naked Time(the 7th episode filmed) - which also aired BEFORE
What Are Little Girls Made Of (the 10th episode filmed) and in the episode they make a BIG point of introducing 'Nurse Chapel'(still played by Majel Barret) and the fact she just recently signed on - since in that episode, it's a major plot point that she was the fiancee of Dr. Roger Corby.
Then in
Amok Time Spock makes a major point of stating that Vulcans do not discuss their mating rituals with outworlders; yet later in
The Cloud Minders Mr. Spock just states off the cuff and openly to the female Droxine that Vulcans mate once every seven years.
Then there's
The Enterprise Incident where, all of a sudden Kirk and Co. are SURPRISED that the Romulans have a cloaking device that renders their ships invisible.

Since they first discovered Romulans had a cloaking device in
Balance of Terror; two seasons earlier. (Also, amazingly, by the next episode, the 1701 no longer has it, although Scotty DID get it working - but this ain't a canon violation per se

).
Also, lets not forget the WIDELY VARYING actual 'speed' of 'Warp Speed' since in
That Which Survives the 1701 traverses 997.6 light years in 48 hours MOSTLY at 'Warp Factor 8' (although to be fair, they did get to Warp 14 for about 15 minutes or so).
