Between me and my ENFP brother:
1. We both love strategy and RPG games. But where he wants characters he can relate to and gets attached to them, and likes to play noble, good characters that save the world and get adored by everyone, I find the characters annoying and predictable and just get in the way of the actual gameplay, and prefer the political intrigue and intellectual gymnastics of working shit out, I want it to be as complex as possible and like to play evil bastards and murder peasants gratuitously
2. With his housemates, he's like a maid and mother rolled into one. He looks after them, he cleans up after them, he gets the food in and checks up on them to make sure they're okay and see what they need. I do my own thing, sometimes share a crate of beer with them if i'm in the mood, and leave their damn dishes on the counter, I ain't washing yo' shit, mofo! And I don't mind being the bad guy occasionally, and living with the resultant hate. I know it'll blow over.
3. He says "I have standards", which means he won't buy non-fairtrade, non-organic, GI stuff and beggars himself buying groceries out of his budget for the sake of his values. I "have standards", which means I won't allow people to treat me like a sucker or take advantage of me, just because I'm a nice guy. His standards are about how well he lives up to his values - mine are about how I see myself and therefore, how I let others treat me.
4. He gets offended over very peculiar things, whilst simultaneously seeming to let people get away with murder. Example: dude keeps scabbing his tobacco and never gets his own, even though he earns three times as much money and could easily get his own - my bro puts up with it and always lets him share. But if anyone suggests that he might have fibbed or been slightly dishonest, or fails to "big him up" to other people, he sees it as gross disloyalty and gets really pissy. I couldn't care less if someone calls me a liar or accuses me of shit I haven't done, I just shrug and let them draw their own conclusions, and trust the facts to speak for me as they reveal themselves, I'll laugh at you as you accuse me, and ask if you wanna join in the networked game of Neverwinter 2, but if you try to take the piss and scab my beer when you could get your own, just cos you can't be bothered to walk round the corner to the store and get some, even though I'm hard up and you're loaded, you can fuck right off mate, I don't wanna know you.
5. If he says something that pisses me off and I get annoyed, I'll let him know right away, then he'll get all upset because I'm shouting and keep telling me he won't listen until I calm down and stop shouting, which just makes me more mad. If i say something that pisses him off, he says "hmmm" and then broods over it for ages and pretends nothing's wrong, then it comes out in an explosion about something totally trivial much later on. And I'll say why didn't you just tell me at the time? And he says, he didn't want to get all angry and cause a scene, and I'll say, dude, I'm fine with "scenes", I'd rather know if I'm pissing you off by you yelling and telling me, than you sit on it all that time and brood!
These are just off the top of my head, and may not be representative of all ENTP/ENFP differences.