Besides movie theatres, you can also make money as a teenager by working at grocery stores. Chains like Fareway and Publix offer jobs for 14-year-olds to make some extra money. Check with grocery stores close to your home to see if they have any job openings.
One of the best jobs for 14-year-olds is babysitting younger children for money. You can babysit for family members or neighbors to make some extra cash. You have to ask around to see if anyone needs a babysitter, and you can land this gig.
While landscaping is a seasonal job, many jobs are seasonal, and you can cash in on it. For example, if your town gets snow in the winter, you can remove snow for your neighbors for some sweet cash or a pool cleaner in the summer.