No, I'm not "confusing the episode with something else". I know what I saw.
It's not uncommon for people to pronunce words differently.
Maybe, but given its the same character and it cost hima regeneration it's not unreasonable to expect the Doctor to pronounce it the same.
This is pretty much my take on it, too. He's not that different a person - he's the Doctor, he had those experiences, and it's not unreasonable that he'd pronounce the word the same way.
My point remains: It annoyed me more than it should have. Bad Pertwee fangirl.