The same with the fight with the two guards outside Cramden's office. Great stuff. I think Coburn's style influenced Bruce Lee ... or other way around? If Coburn did OMF in 1965 or so, and he met Lee a couple of years later (I'm not certain) .... And after the fight, the comedy is just right; a blend of silliness (the light bulb) and straightness, with Flint saving a life.
Notice also when Cramden is darted, and Flint doesn't mug when he does the cut.
But in the sequel, Coburn is all over the place, over-mugging. While most of the credit for the downsizing of Flint goes to the writers, Coburn also has to take some blame. There is hardly an action scene where he plays Flint like a fighting master ... just for laffs. Again, counter this with OMF : when he climbs the ladder with the guitar rift, happily Coburn doesn't wink and mug. With that great music, it would've ruined the scene(s).
However, the scene in the penthouse, with Flint talking about eating grubs is the Flint form the first movie.
The director should have seen this. Or maybe Coburn thought the script was so dumb, he just let loose and had his own jokes. But Flint loses his fun when it became too much Austin Powers.
Btw, the Powers movies would have been much better if they had been played as a homage to Flint/Bond. That's what OMF did so well. Created a great character with the perfect actor to play him.
But even tho ILF is so inferior to the first, it's still a lot of fun. How can I say this? Because he's still Flint!