Isn’t that the truth. The dialogue is so fast and furious in that movie it’s impossible to catch all the quips the first time you watch it.
That is Nugent's main beef with the film:
Hysteria is one of the communicable diseases and "His Girl Friday" is a more pernicious carrier than Typhoid Mary. It takes you by the scruff of the neck in the first reel and it shakes you madly, bellowing hoarsely the while, for the remaining six or seven. Before it's over you don't know whether you have been laughing or having your ears boxed. The veriest bit on the strenuous side, if you follow us.
Another Cary Grant movie that’s fast paced (but not as fast paced as His Girl Friday) is Arsenic and Old Lace, great fun to watch.