Your summary seems pretty accurate. I don't think there were many programming errors outside of P's meltdown, though. Also, as has been touched upon elsewhere in these comments, some of the failures to maximally exploit simple bots were necessary side effects of the attempts to trick complex bots, not just failures to anticipate there being a significant number of simple bots at all. (Sort of a quantitative instead of qualitative prediction mistake--we just thought there'd be more complex bots than simple bots).
One clue towards the general simplicity of the field is the generally atrocious formatting (e.g. close-parens on their own lines)--not many people seem to have had too much experience with Lisp, let alone Lisp projects as complex as this game can get. That's a shame, but it's not like any non-Lisp languages are remotely suitable for the kind of source analysis we all wanted to see in this game.
The prisoner's dilemma tournament is over. There were a total of 21 entries. The winner is Margaret Sy, with a total of 39 points. 2nd and 3rd place go to rpglover64 and THE BLACK KNIGHT, with scores of 38 and 36 points respectively. There were some fairly intricate strategies in the tournament, but all three of these top scorers submitted programs that completely ignored the source code of the other player and acted randomly, with the winner having a bias towards defecting.
You can download a chart describing the outcomes here, and the source codes for the entries can be downloaded here.
I represented each submission with a single letter while running the tournament. Here is a directory of the entries, along with their scores: (some people gave me a term to refer to the player by, while others gave me a term to refer to the program. I went with whatever they gave me, and if they gave me both, I put the player first and then the program)
A: rpglover64 (38)
B: Watson Ladd (27)
c: THE BLACK KNIGHT (36)
D: skepsci (24)
E: Devin Bayer (30)
F: Billy, Mimic-- (27)
G: itaibn (34)
H: CooperateBot (24)
I: Sean Nolan (28)
J: oaz (26)
K: selbram (34)
L: Alexei (25)
M: LEmma (25)
N: BloodyShrimp (34)
O: caa (32)
P: nshepperd (25)
Q: Margaret Sy (39)
R: So8res, NateBot (33)
S: Quinn (33)
T: HonoreDB (23)
U: SlappedTogetherAtTheLastMinuteBot (20)