Changes in OI:
1) $CMG - lots of volume yesterday, but the change in OI tells you that at least some of yesterday's activity was from intraday trades.
2) $MSFT 530c 10/16 opened Friday and closed Monday. Note that on Friday they created over 10000+ new contracts with their trade. However, when they closed it OI only dropped by 3957 which might lead someone to believe that only part of the position was closed.
3) Similar situation to $TSM 330p Dec... 5000 puts sold back in April. 5000 bought to close yesterday (although filled at the bid), and open interest only decreases by 2123.
4) $INTC 105p April opened yesterday at the bid. Breakeven of around $91.50 by expiry