With regard to the ball- see if you can get clear scans because I'm not sure if it is shakiness in the signature or just a pixelated scan; it could be authentic but I wouldn't say 100% for sure unless there are better scans.
The DiMaggio photographs look no good. The M in the first one and the g's in both look bad. Also, I've come to notice that the "Ds" in DiMaggio that look like the Diet Coke "D" usually are not authentic/questionable.