Have you replaced any British words with their American versions?
For example, switching out the word 'boot' for 'trunk', or ditching the word 'rubbish' for 'garbage'.
This is something I've noticed my 6 year old does pretty regularly. We went through a stage where 'sweets' became 'candy', 'holiday' became 'vacation' and 'courgette' became 'zucchini'.
That last one didn't happen but if you're still reading you've got my respect, or as the Americans might say '...mad props'.
I’m American. I couldn’t come up with trunk so I called it a boot. Thanks to all those episodes of Top Gear I’m sure. Bonus is that my wife and I watch enough Dr. Who so that she knew what I was referring to.