1) this referred to the then-and-there negotiations and its possible the "15 times" was a joke
2) the Zygons were calmed/reassured by Bonnie via the central squelchy thing; very few humans (who survived) were aware the Zygons existed.
OTOH its not clear how they handled the disappeared in New Mexico
"justice" maybe, revenge no
3) didn't happen so n/a
OTOH, how much did the people in the pods remember between capture and release ?
5) there is a lot of recent/current British SciFi - sadly most of it gets overlooked when it comes to TV and film