Distractions: C List
(all but # 1 keyed to Diana Hacker’s Rules for Writers)

(1.) Careless error (proofread out loud, very slowly)
3. Apostrophe (p. 296)
19. Sentence Fragment (p. 156)
20. Comma Splice (p. 164)
20. Fused Sentence (p. 164)
43. Spelling (p. 326, p. 531)

Specific distractions:

it's/its
apostrophe in the plural noun
could of, should of, would of, may of
loose/lose
suppose to, use to
than/then
there/their/they're
to/too
weather/whether
your/you're

(see Glossary of Usage in Hacker)