So if you have no reason to worry, I wouldn't worry. If you're innocent, don't worry about it. Any criminal case is going to have to have evidence beyond a reasonable doubt. That's a pretty strong burden of proof. And if you didn't do anything, then they won't have that proof. They have your name for some reason, but it could be a fishing expedition. It could even be a scam. Did you check the phone number against the number for the police department? You might not get a chance until Monday, but Google the police department phone number (don't use the number he gave you) and ask for this officer. See if he's real in the first place. And then ask what he wants (if he is). Again, if you didn't do anything, you don't have anything to worry about. And he knows this. If you're acting like you don't have anything to worry about, he'll pick up on that and realize that you're not culpable of anything.
Now of course you should certainly ask what this is about, and don't admit to anything. You can always say "I don't remember" because you never fully remember. And if something looks like it's going south, plead the 5th amendment. But otherwise, don't worry about it. It doesn't sound like there's anything to be worried about on your part.
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable.
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Thank you, ***** ***** luck to you!