These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Product Placement: It seems that about the time they started featuring American Motors Matadors as the primary squad cars, Reed and Malloy started pursuing a lot more AMC cars. Not to mention that Malloy buys an AMC Matador to replace his Mustang in season six.
They Just Didn't Care: Due to glare issues, the windshield was removed from the car used for the many in-car scenes, causing the spring-loaded wiper arms to park against the dashboard. No attempt was made to disguise this.
Shipping: A lot of Malloy/Reed, as one might expect.
Unfortunate Implications: Sometimes come across straight, sometimes as subverted and blithely humorous, as in this exchange:
Malloy: What do you do?
Ruth: I work for a firm that sells digital computers. I'm a computer programmer.
Malloy: *looks her over* Could have fooled me.
Ruth: Thank you. And you don't look like a cop, either.