maybe obvious but i've always been suspicious of these things. but i focused solely on these two tonight and they are almost pure tells.
1. when a player is last to act and checks and they don't think the dealer hears them so they repeat themselves. but it's usually like a combo table tap and vocal...like a tap...and then a verbal confirmation of the same. pure weakness. call it the multi-check.
2. when a player checks and they immediately stare at the dealer like ... hope you heard me i checked, i'd hate for you to mistake my check for a bet and i'd have to put anymore money in the pot. i tend to see this one when they are a little unbalanced towards draws. it's an indication of "did you fucking hear me, hurry up and burn and turn before someone changes their mind." it's not possible to change minds but it's a human reaction.
i know these sound pretty straight forward but i consider them lock tells from weak players so keep a look out and let me know if they help you.