Initial pitch-up
bearfoil, BOAC, and others,
At risk of unnecessary repetition, the BEA Interim Report #2 (Page 48) shows that, with a sudden drop in the perceived dynamic pressure (blocked pitots) the ADR will infer a drop of altitude of the order of 300ft. So, while maintaining FL350, the altimeters might have dropped suddenly to indicate 34700ft erroneously. It's conceivable that this might have been the reason for the PF's initial pitch-up command.
In their most recent Update, the BEA says that ASI1 dropped from 275kt to 60kt, but I have to admit that at the moment I don't know which altimeter reading that would have affected. Perhaps one of our ADR students will shed light?