Foot traffic (shingle butt) wear.
Look for butt wear this on natural paths of travel.
This is excessive wear and a manufacturing defect.
Foot damage caused by making sudden turns on a hot or new roof.
Caused by wind-blown items.
Typically dropped tools.
Caused by careless roofers during installation.
Faked hail damage.
Ball peen hammer.
Note the crushed granules. Hail does not crush granules.
Creased shingle tabs.
Bent-back shingle tabs.
Shingle blow off.
Bonding of asphalt shingle fails first above the joints in underlying shingles.
Widespread wind damage above joints is an indicator of weak bonding across the roof.
Shingles that blow off in groups indicated that the roof was well-bonded.
Note that the shingles in the photo above were high-nailed.
When dry roof sheathing is installed before it has had a chance to reach equilibrium moisture content (EMC) with the homesite environment, it will expand as it absorbs moisture from the air. If shingles have been installed before sheathing reaches EMC, shingles may buckle at panel edges.