I have noticed a few one off of moments where it seemed scripted. One was benefit for me when I returned a kickoff for a TD, and the other was the CPU breaking a long TD run. I won't say that it was, but it seemed like in these plays the runners had an extra gear that they normally don't have.
However, I highly doubt the 25 play/52 yard TD drive happened. I find that to be damn near impossible, especially in Madden. It would have to be aided by penalties (which rarely occur in madden) and probably multiple 4th down conversions (the CPU rarely goes for it on 4th and short), etc. That is barely above 2 yards per play, to get a first down in 3 plays the CPU would have to average 3.33 per play under "normal" circumstance.