anyway i have stated in first post, if you're facing unwanted issue while flashing please "reboot to recovery" and do flashing once again.
regardinf vbmeta failed to verify, i think he isn't flash vbmeta disabler in the first place
AFAIK, footer error is related to meta-inf updater-script and it's fine.
did you install opengapps after rebooting to recovery not straight after rom installation?