When the Joey is outside she has a conversation with someone of the inside of the building - they can hear each other easily as no one has to raise their voice. Glass like this in towers is very thick and tough and would deaden noises.
A proof of how tough the glass is that later on she tries to break the glass with a heavy wrench without success..
The film takes place in the UK, but at 47:04 minutes, Zee says: "And we've got maybe two minutes till the Feds show". Feds? In the UK?
Joey spends a lot of effort desperately trying to get into the building when she could easily have climbed in the broken window from which Marcus was originally thrown out. As an alternative she later had the option of climbing in the enormous holes made by the explosive that was lowered to the cleaning stage.
Joey rappels on a set of ropes before climbing into the swing stage. When she is on the platform the ropes she was previously hanging on are nowhere to be found.
The Daisy Ridley character asks if she can keep the 33 million, there was no way she could have known about that, nobody told her.
At 1:10:09, when Joey is fighting in the utility room, one of the attackers attempts to shoot her but his gun is out of ammo. He hadn't fired his gun previously at all.