One benefit of the database DVD format is that you can always look at the games directly and analyze variations outside the recorded DVD presentation.
It was especially useful for me to further concentrate on mating nets, for example, which for a long time has been a weakness in my board sight. While it's always a little frustrating and disappointing not to get a solution, it's always good for training to be exposed to the ideas that you weren't able to see, which helps fill in the holes in your game. I was able to get most of them, although a couple of the longer and more complex combinations escaped me. The quizzes often go through multiple moves in sequences from the same game, thereby providing more depth than one-off tactics problems. While these are not hardcore tactics drills, this approach helps illustrate more of the "real world" considerations for evaluating a position.
However, the interactivity of the computer DVD format is explicitly intended to help you think actively when you are going through all of the games. This kind of "extra" learning through observation is a feature of any level of game analysis you may practice. Along with major combinations and ideas that are demonstrated for you (or that you are asked to find) are a number of useful recurring minor concepts that you will see (even if they are not always explicitly highlighted). Most of the content is centered around the idea of incorporating tactics and positional play, in a number of real-world game examples. This includes the Scholar's Mate (f7), Legal's Mate (f7), etc.The above quote, which IM Tania Sachdev paraphrases a couple of times during her commentary on this DVD, sums up well the approach to tactics that it takes. This means a tactic/threat that attacks your opponent's two weakest squares: f7 and f2. After you are used to solving tactics, it will be easier for you to spot tactics in a game and when you are solving tactics on the tactics trainer. Also, practice tactics as much as possible. This will take time, so focus on taking time to solve the problem instead of trying to solve it in a quick amount of time. You will eventually get tactics like these. You could possibly miss a forced checkmate and instead you go for basic tactics that could win the queen.
Another thing you need to do is LOOK AT THE WHOLE board.