I had a mucocele removal yesterday and I still feel numbness in my left sid of the lower lip which the mucocele was in. Is that normal?

Perhaps. This happens sometimes. It is best to call the surgeon who performed the procedure to advise him\her of what you feel, get some advice, and when he\she wants to see you for a follow up visit.
Possibly. It depends if the numbness is due to the surgery or the anesthetic injection. See your surgeon for a follow up.
Yes. Removal of a mucocele in the lip requires excision of the affected salivary gland and sometimes some adjacent glands. Anytime tissue is removed from the body, there will be some altered sensation. The numbness in the lip should resolve with time.