Answer:
Yes, there is an error: a comma splice.
Explanation:
A comma splice simply means a comma placed incorrectly. Here there are essentially two sentences, but there is a comma separating them. That's wrong because a comma alone cannot (does not) separate independent clauses (simple sentences).
To correct the error, you can simply add a coordinating conjunction (and, but, yet, so, or, for, nor) - in addition to the comma to create an acceptable compound sentence (which is two simple sentences connected together.)
All of our locations have drive-through service, and some even have delivery service.
