Dr Evil is based on the character in the wheel chair "For your eyes only" the one who took control over James Bond Helicopter. You could only see his suit(which was blue), his bald head and the hairy cat he was carrying with him.
Austin Power hairy chest was based on Sean Connary Bond, hairrier then usual chest.
Blofeld (the basis for Dr. Evil) was in plenty of Bond movies before For Your Eyes Only. He had the scar and everything in You Only Live Twice, and, earlier than that, he said things about not tolerating failure. Dr. Evil is completely lifted from Blofeld, it's amazing when people (not you) think he's taken from another source.
Also, Number Two is from Thunderball. Emilio Largo from that film was SPECTRE's number two agent and he had an eye patch.
The Frau could be Rosa Klebb and/or Irma Brunt from On Her Majesty's Secret Service. I forget which Bond film it was, but I'm sure there was one in which a failed SPECTRE agent was electrocuted in his chair, which then vanished into the floor, not unlike Dr Evil's lethal chairs.
The mutant sea bass were probably based on the pirhana tank in (IIRC) You Only Live Twice, but there are similar incidents in a number of Bond movies. The Irish assassin's use of his lucky charm bracelet to strangle Austin would seem to be based on Red Grant and his watch-garrot in From Russia With Love. Austin suggests the toothpaste tube contains plastic explosive, and I'm pretty sure in one of the Bond movies it actually does.
The leaving him in the trap is in a lot of movies, usually a staple of Bond films. Where Bond always escapes from death traps. (shark trap Thunderball)
I forget which Bond film it was, but I'm sure there was one in which a failed SPECTRE agent was electrocuted in his chair, which then vanished into the floor, not unlike Dr Evil's lethal chairs.
There's so many of them, large and small. I'll toss in - - Dr. Evil uses a spear gun (against his own minion) on dry land - "Thunderball". - Austin in the hot tub with Alotta - she tells him "In Japan, men come first and women come second" - straight out of "You Only Live Twice". - "No, Mister Powers, I expect them to DIE!" - see "Goldfinger". - Impossibly slow dipping mechanism from "Live And Let Die". - Dr. Evil wears a clear plastic radiation suit/headpiece similar to those in "Dr. No". - Random Task sneaks into the final scene with his weapon in a room service cart, like in "Diamonds Are Forever" - Austin and Vanessa gaze up at an unusually bright star too. Certainly many more.