Jack shaves off his beard at 9:00 a.m. By 10:00 a.m. (riding in the car with the three villains), he already has a five o'clock shadow. At 11:00 a.m. he's more cleanly-shaven again. The beard seems to come and go.
When Jack gets out of his car at the auto shop, the camera drifts down and reveals a squarish, tattered hole in his Levis. In the long shot showing him walking up to the door and into the shop, the hole is magically gone.