When we see the SEAL zodiac from below, we see a burst of bubbles coming up underneath them, however, when we see the Zodiac from above moments later, there are no bubbles bursting around them.
When the Colorado fires its missile to warn Washington of its resolve one nuclear explosion results. However, all United States Navy SSBNs are armed with the Trident D-5 SLBM. These missiles are armed with 4-8 MIRV warheads so there should have been 4-8 nuclear explosions. In fact the US Navy has not deployed a single warhead SLBM since the Polaris missile system of the 1960s. Chaplin, in effect, has the ability to devastate between almost 100-200 cities worldwide...not just Washington.
The first episode opens with the USS Colorado on a mission to pick up a U.S. Navy SEAL team from Pakistan's coast. In reality, ballistic submarines would never be risked in such a way - their entire mission is to remain away from any possibility of detection. A mission like this would instead be given to an "Attack" submarine of the Los Angeles, Sewolf or Virginia classes - nuclear powered, but without any ballistic missiles.
Based on submarine's position reported by Lieutenant Grace Shepard, i.e., 1,012 klicks south of Sri Lanka and crossing Equator, a nuclear missile fired from anywhere nearby that position would not even reach the mainland United States as reported by the officer (crossing over Indiana).
The captain pulls out a hip flask and pours himself and the XO a drink in his cabin. US Navy regulations have forbidden essentially all alcohol for a century.