Has the paint surface become pock marked?

Like the name would suggest, alligatoring occurs when painted surfaces crack into a pattern (often resembling the reptile's scales).

Have two painted surfaces become stuck together?

Is the paint surface showing shiney marks?

Checking is a similar issue to alligatoring, but it is less severe. Checking usually manifests in long, shallow, fairly evenly spaced cracks in the paint film. Checking can sometimes become severe, leading to deeper cracks in the paint.

Has the paint surface begun to flake or peel?

Are there differences in the sheen and colour of your paint?

Is your paint coming loose from the wall?

Does the paint surface have unintentional patterns?