I’m not American, but I after living here - I’ve noticed a few. They sometimes say “axe” for “ask”. They fail to enunciate “respiratory” fully - they say “res-pah-tory”. Also, they fail to pronounce the f in fifth - like they say fith. Certain words like “squirrel” tend to get squished into “skwol” while I’m used to pronouncing it in two syllables. I’m trying to think of similar examples.

Edit : I now realise that all of the above are incorrect examples in the context of what is being discussed. Pardon me!