Some bad examples I'm aware of:

>Japanese + Chinese using ketchup in "Italian" food
>Japanese using a British (kek) recipe for "Indian" curry
>Americans using broccoli in "Chinese" food
>Americans using xtra-sharp cheddar in "Mexican" food
>Americans using pineapple in "Italian" pizza

One good example I'm aware of is Peru and their Chinese-origin "chifa" cuisine, such as lomo saltado.