I'm interested in hearing some minor house rules people have.

Here's one of mine I'd like to share: Thieve's Can't must be used in conjunction with another language, and those with the language can roll an insight check against the user's intelligence score to determine if they are speaking in tongues. Thieve's Can't users automatically succeed these checks. 

I'm not sure if these count as minor, but:

• Healing potions only take a bonus action to drink
• All familiars, summoned creatures, etc that would normally roll initiative just go right after the caster
• The Paladin's Divine Sight feature can be expended as a bonus action to succeed on a knowledge check on a demon or undead creature they can see
• All magic items with the Thrown keyword return to your hand after being thrown
• Sorcerers can use the Spell Points system instead of spell slots
• The extra damage from a critical hit can't be less than your proficiency bonus

The forth one undermines pre-existing returning weapons, so I'd rethink that one.

Spell points I feel should be all or none (doesn't mesh well with warlocks though...)

These seem cool house rules all in all though.