It's hard to tell without seeing the negatives in person. I quite like the first shot, which looks pretty normal. The second is probably strange due to the artificial lighting in the store, or your scanning method. It's surely not the camera, but may be old film. Unfortunately a drug store lab is not exactly a professional job, so w/o knowing if the film was out of date, stored improperly, or processed improperly, it's hard to know exactly what's up. I would suggest buying some film from Freestyle Photo or a pro lab in your area (if any) and having it processed at a better place and see how it goes. My guess is all will be fine.