• Furor for Druids 10+, see https://classic.wowhead.com/spell=17056/furor
• Throw for Hunters 20+, see https://classic.wowhead.com/spell=16000/throw
• Feed Pet Effect for Hunters 10+, see https://classic.wowhead.com/spell=1539/feed-pet-effect
• Track Humanoids for either Druids 32+ or Hunters 10+, see https://classic.wowhead.com/search?q=Track+humanoids
• Instant Poison II or greater for Rogues, see https://classic.wowhead.com/search?q=instant+poison
• Relentless Strike Effect for Rogues 20+, see https://classic.wowhead.com/spell=14179/relentless-strikes
• Flurry for either Shamans or Warriors (missing level), see https://classic.wowhead.com/search?q=flurry

Also add an option to complain about missing spell data, for development purposes.