Just as in Vote of Confidence (1988), this episode is an example of politicians trying to influence police action to protect a campaign.
DAT stands for Digital Audio Tape, a fairly new technology in 1989, designed to be a tape equivalent of a compact disc, but congressional regulations and advances in technology rendered it obsolete, and the last DAT machine was made in 2005.
Crockett uses his famous "clear my desk" line -slightly paraphrased to, "I will clear my desk of all my other cases and spend every waking hour making sure you fry for the murder of a cop!" -for a final time in this episode. He would use the line a total of four times over the course of the series -the other three occasions being in One Eyed Jack (1984), French Twist (1986) and By Hooker by Crook (1987).
Although never explicitly stated in the episode, it is reasonable to assume that Justin Lazard's character "Joey" is the same Joey Hardin he played in Line of Fire (1988), now working for the Metro-Dade police after his time in the DEA. He mentions that he has just "started working Vice" and that Crockett helped him to secure the job, while his given surname, "Chandler", is likely just a cover name, as it is used in the presence of criminals he is investigating undercover. Lazard would return as Hardin a third time in Leap of Faith (1989).
Philip Michael Thomas invented the term EGOT to describe the achievement (that, to date, Rita Moreno and 17 others have achieved) of winning an Emmy, a Grammy, an Oscar and a Tony for acting. Thomas planned to accomplish this task himself within five years, but ultimately he never received a nomination for any of the awards. However, the term he coined lives on, and was even used as a plot device in several episodes of 30 Rock (2006).