A few years ago I was amused to see that some Australian domestic airlines placed the orange "armed" tape across the emergency view window...thereby partially obscuring the outside view when needed in emergency conditions to check outside for fire or other danger before evacuation...
The tape across the window shows those from the outside that the door is armed on those "next generation" type aircraft. Yes, it is very next generation that dates back to the 100 series 737 from 1968.
In an emergency, the crew procedure would be to flick the tape aside to assess outside before opening the door.