How do you make it obvious you are on a production system?

The red prompt is a good idea, which I also use.

Another trick is to put a large ASCII-art warning in the /etc/motd file.
Having something like this greet you when you log in should get your attention:

 _______ _    _ _____  _____   _____  _____            
|__   __| |  | |_   _|/ ____| |_   _|/ ____|     /\    
   | |  | |__| | | | | (___     | | | (___      /  \   
   | |  |  __  | | |  \___ \    | |  \___ \    / /\ \  
   | |  | |  | |_| |_ ____) |  _| |_ ____) |  / ____ \ 
   |_|  |_|  |_|_____|_____/  |_____|_____/  /_/    \_\


 _____  _____   ____  _____  _    _  _____ _______ _____ ____  _   _ 
|  __ \|  __ \ / __ \|  __ \| |  | |/ ____|__   __|_   _/ __ \| \ | |
| |__) | |__) | |  | | |  | | |  | | |       | |    | || |  | |  \| |
|  ___/|  _  /| |  | | |  | | |  | | |       | |    | || |  | | . ` |
| |    | | \ \| |__| | |__| | |__| | |____   | |   _| || |__| | |\  |
|_|    |_|  \_\\____/|_____/ \____/ \_____|  |_|  |_____\____/|_| \_|


 __  __          _____ _    _ _____ _   _ ______ 
|  \/  |   /\   / ____| |  | |_   _| \ | |  ____|
| \  / |  /  \ | |    | |__| | | | |  \| | |__   
| |\/| | / /\ \| |    |  __  | | | | . ` |  __|  
| |  | |/ ____ \ |____| |  | |_| |_| |\  | |____ 
|_|  |_/_/    \_\_____|_|  |_|_____|_| \_|______|

You could generate such a warning on this website or you could use the figlet
command.

figlet

Like Nicholas Smith suggested in the comments, you could spice things up with some dragons or other animals using the cowsay command.

dragon cowsay

Instead of using the /etc/motd file, you could also call cowsay or figlet in the .profile file.

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