When the family is told...
(A bit of a spoiler)
My only real gripe about this movie is how the family is told. When LCDR Robinson arrives at the Sullivan's house to deliver the news that all 5 sons have been killed in action, his demeanor is just too lighthearted, casual and cheery (at first). He certainly doesn't seem like someone is about to tell a mother that five of her children are dead. One in that position I think would be sullen, nervous and gloomy ( know I would), which to me seems more appropriate given the grave nature of the news about to be delivered.
I lay initial blame on Ward Bond, a usually competent, skillful actor, who just blew the scene. It is possible although that Lloyd Bacon directed him to play it this way. If not, Bacon wasn't perceptive enough to see how poorly it came across, so either way he really is to blame for this awful scene.
Now I understand that perhaps the family was lucky to be told in person at all, since most KIA notifications in WWII were delivered by telegram, but still, the mood was all wrong.
Here's how it sounded: "Hey howya doin? Good to see you! Your sons are dead. Can I have a cup of coffee?"