Technically, 3.4 megatons is not "100 times" more powerful than Hiroshima but between 189 to 260 times more powerful.
On the other hand, after more than 50 years, even if the bomb was not damaged in the crash, it would not achieve its design yield. The fusion stage contains Tritium, which has a half life of only 12.3 years and needs to be replaced on a regular basis. After more than 50 years, less than 1/16th of the Tritium would be left. The rest of it would have decayed into Helium-3, which would not only not undergo fusion but even steal neutrons from the fission primary during ignition. So with any luck, the bomb would 'fizzle' (=no nuclear explosion, or at least 'only' a 'small' one).
It would however still pose a very significant security threat because you could use its fissile material to make a functional nuke, reverse-engineer H-bomb design secrets etc.
When Ziva shows Tim her American passport, Mcgee then looks at the passport commenting on how nice the photo of her smiling is. You are not allowed to smile on your passport photo.
The B-47 that disappeared in 1956 did not carry a Hydrogen Bomb. The plane was transporting nuclear weapons materials in carrying capsules. This disappearance was considered a Broken Arrow situation because there was no chance of a nuclear detonation.
The agents and even some portraying another capacity, refer to Gstadt, Germany as 'G=stad' which is wrong. The correct pronunciation leaves the G silent and is merely said as "stadt.
Dinozzo Snr calls out the President of the World Bank, "How's the finance world?" The World Bank is centred of development not finance.
Abby checked the victim's clothes for radiation but had no reason to do so.
When Abby scanned the bomb plate with a Geiger counter and claimed that it was emitting beta particles and gamma rays. A Geiger counter cannot distinguish between these. It can only detect amounts, not types, of radiation.
Ducky refers to the British (Royal) Naval College in Dartmouth, Devonshire. A native of the UK would be unlikely to call it "Devonshire", but just "Devon".
The Deputy Director for Operations is at one-star rank, not three star.