- D-Day was originally set for June 5 but had to be postponed for 24 hours due to bad weather.
- In military terms, D-Day means a date and H-Hour a time for combat operations.
- Civilian casualties on D-Day and D+1
- are estimated at 3,000 people.
- 4% of the sand on Normandy beaches are still made up of metal particles from D-Day landings.
- In 1944, by a huge coincidence, a crossword puzzle was printed with answers all containing D-Day operation "code names", which sent MI-5 into a panic thinking their invasion plans had been discovered.
- In 1942, the Canadians and the British Navy launched a practice invasion of France, the "Dieppe Raid." 20% were killed, 10% wounded, 30% captured. The lessons learned in that disaster lead to D-Day's success.
- J.D. Salinger arrived in Normandy on D-Day carrying with him a work in progress: "Catcher in the Rye".
- Theodore Roosevelt Jr was the only General involved in the initial assault on D-Day, after insisting to his superiors to be one of the first ones off the boats. He survived, then died of a heart attack one month later.
- The actor who played "Scotty" on Star Trek was shot 6 times on D-Day: 4 times in the leg, one in the chest and one through his finger.
- The German airforce was outnumbered 30:1 on D-Day and didn't shoot down a single allied plane in air-to-air combat.
- On the night of the D-Day invasion, only 15% of paratroopers landed in the right place.
- To plan for D-Day, the BBC ran a competition for French beach holiday photographs as a way of gathering intelligence on suitable beaches.
- The Allies parachuted dummies over Normandy on D-day to distract Nazi gunners from the real paratroopers.