How you can tell this is in a whole other world....
I love this show. Columbo is my favorite cop or detective of them all!
However, you can tell that it is fiction based on:
Every murder case is a rich white person and sometimes they are famous or well known when those kinds of killers and murders are very rare compared to your run of the mill street crimes.
Columbo doesn't ever take them in for questioning as detectives would do. He always shows up and hangs around where they live and work.
Just the way that Columbo is and acts.
There are opportunities and the killer doesn't try to kill Columbo.
Sometimes at the end it's just Columbo and the killer sitting there together with no other cops around.
After Columbo gets the killer, he is never seen put up against a wall, frisked and taken away in handcuffs.
Anything else?
I don't know jacksht about anything. - kinch_telemachus