Al tells Ruth he doesn't want her to stay up late seeing him off at the train, but he departs during the day.
At one point while Al and Ruth are sitting around the campfire while out hunting Pheasants, Al opens a can of corn and empties it by dumping it directly into a pot and then placing it over the fire. In the shot immediately following, Al is holding the pot in one hand and a large spoon in the other, without sufficient time elapsing to have picked up either item.
After the first big wave of attacking Japanese soldiers ends, there is a shot showing numerous dead Japanese soldiers lying in the lagoon leading up to the bunker. The next shot, showing the next wave of Japanese soldiers entering the lagoon, no longer shows the dead soldiers from the first wave lying dead in the lagoon.
Comments here about "Lee Diamond" being 52 years old and a MGSgt refer to Leland "Lou" Diamond - not Lee Diamond who is referred to in this movie.
About 23 minutes in, when everyone is listening to the radio with the newsflash about Pearl Harbor, the setting in the house is dinnertime. The bombing of Pearl Harbor was early on a Sunday morning. Even if the radio Jim was trying to repair had been broken all day, the family might have heard the news from some other source before the end of the day at dinnertime. But, since Philadelphia time is 6 hours ahead of Hawaii time, it would have been between 2:00 and 3:00 PM in the eastern US when the attacks on Pearl Harbor occurred. Therefore, it is reasonable to assume that the news reports did not reach that part of the country till late afternoon or early evening.
When everyone is listening to the radio (about 0:23), the commentator giving real-time updates about the attack on Pearl Harbor remarks that America is "at war" with the Japanese. This would have been technically incorrect, as war was not declared on Japan until the following day, December 8, 1941. The declaration was done by way of Joint Resolution, formulated not long after FDR delivered his noteworthy 'Infamy Speech.'
At the end, when getting into a taxi, the taxi driver asks "Where to?' The answer is "Home", and the taxi driver starts driving. Someone might ask how the taxi driver would know their address, but it was common for for cabbies to start driving and then, if needed, get further details on where to go.
In the last long shot showing the battlefield above the lagoon, the top half of the shot moves horizontally showing where the painted matte of the jungle above begins.
When Al and the Merchants are gathered around the radio listening to the news flash about Pearl Harbor, none of the tubes in the radio are lit up - the radio is obviously not turned on and nothing would be heard.