Q: Berserker took no damage from Archer's A-rank Noble Phantasm "Broken Phantasm" (Caladbolg), is it ineffective due to Berserk's Noble Phantasm, or was he simply able to withstand it naturally? <Not Mr. Shanoa>

Nasu: Oh, that. In the original work it was like "Even though up until then none of the attacks had been worth dodging, this one would have been fatal, so Berserker counters → the resulting explosion from the Noble Phantasm is devastating." Yet in the anime version it was handled as "Berserker could not respond to it due to a severe injury from Saber → losing one of his lives, and regenerates," which may be something to think about. In all he lost 2 lives because of it.
Takeuchi: Oh, so that's why God Hand in the anime version needed 3 days to recover!

Fate/Stay Night Animation Material I; Q&A, pg. 40