Could this be something more, or am I reading too much into it?

So... I'm friends with this kid who I do like and recently I've noticed that his conversation style has changed. We used to have, not serious, but normal conversations. (- What's up? - I have dance tonight. - Oh, ballet? - Yeah, it should be fun.- ) But now he's gotten really goofy and silly. (-What's up? - Wandering - Aimlessly? lol - No in a general direction - What direction? - One direction ;) - ) He's also been kind of playing, not pranks, but joking around with me. Nothing bad, just things like having him and his friend text me the exact same thing at the exact same time, calling me the nickname no one has in a long time, telling me his sister lives in a different place each conversation and then when I mention things like "How's your sister liking Pennsylvania?" he'll say "Pennsylvania? She lives in Rome!" and I'll say "I thought you said Pennsylvania, like Pittsburgh!" - "No, Pennsylvania like Philadelphia." It's all harmless little goofy conversations. I wasn't sure if he's being flirty (maybe? possibly?) or if he's just being silly. It's all playful conversation and I really do enjoy them, so I don't want to mention anything to him and have him think, "Oh she thinks it's weird, I'll stop." I think I might mention something to one of our mutual friends just to see if he's heard or noticed anything, but I don't want to make an idiot of myself. So, am I just reading too much into it or could there be something more? Thanks guys!!