You absolutly have the right to know why you are being arrested, you then have the right to be infomred of your right and then be cautioned. It’s called ARC arrest, rights, caution. As soon as you are in cuffs and you are made safe (weapons, means of escape) you are to be infomred why. Being notified after you are released, being interviewed by various cops that did not proivide a secondary warning is a viloation of your rights making almost everything inadmisable. Yes the case is weak, and the cop only gets overtime if it isn’t on his regular shift. If found innocent you may be able to file for recovering lost wages, this I’m not sure of.
As for the cop meeting the bare minimum, I don’t see anywhere in that write up where that is done.