Hard to say without seeing it, but if you have some touchup paint for the ceiling, it couldn't hurt to try some of the spray popcorn you can buy in a can at Lowes, especially since it's just the garage. That stuff is actually pretty good.
Back in Texas, I had my attic water heater replaced one time, and they used a defective CPVC elbow that sprang a leak and sprayed the bathroom ceiling over the shower. I came in the next morning to find a giant bubble of water-filled paint hanging from the ceiling. It let loose as I was standing there in amazement, which caused the entire ceiling over the shower to fall down. What a mess!
The plumber refused to pay for anything but the elbow and I didn't want the hit to my insurance, so I fixed it myself. After I repaired the drywall, I used that spray-popcorn-in-a-can stuff to match the rest of the ceiling. After I repainted the ceiling, you couldn't even tell the difference.
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