Here are things that I thought was disappointing that they weren't adapted.
- Lokar being Rita's Boss I thought it would have fit more with him being the Master since he was just a head much like Zordon was
- Ohranger vs Carranger
- Carranger vs Megaranger
- Gaoranger vs Hurricanger
- Dekaranger vs Magiranger
- Gekiranger vs Go-Onger
- full Go-Onger vs Shinkenger
- Vrak assuming a Nighlok form
- The zord configurations that we didn't see.
- S.P.D. Gold Ranger
- Blast Buggy
- Talon Ranger