When Malloy borrows the blazer from a pedestrian, he buttons up the jacket. In the next shot as he turns the corner, the blazer is open.
During a driving scene, the Adam-12 patrol car changes from a '69 Plymouth to a '65 Plymouth and back again.
In California, the crime of bribery is defined as offering, giving or taking something of value, with corrupt intent, in order unlawfully to influence a person in any public or official capacity. Since a "job offer" extended before trial has intrinsic "value", the prosecution could easily prove the charge of bribery of a public official, especially when the same offer is rescinded after the trials undesirable outcome.
When Malloy and Reed are in the Lieutenant's office and the phone rings, they plan to trace the call from Mr. Erickson, however this wouldn't be possible in the brief time they are on the call and with the technology available in 1968. Then Malloy phones Jack's bar without looking up the phone number.