Now that I think about it... If there are no oceans for the moon's gravity to pull on, what happens there? O_o
If the process of the freeze is at a regular pace then tidal flexing will most differently still occur. The moons constant pulling actually generates friction in the oceans which generates heat which would make a layer of ice on top with ocean deep underneath. It's one of the reasons some people believe that their may be life on Europa one of Jupiter's moons because of the ocean underneath all of the ice might actual sustain some micro organisms which do not require oxygen. However if all the Earth's water was to be frozen at once I'm not exactly sure what would happen. That probably doesn't have any hold on whether man will survive or not but that is what happens.
A way you could freeze the world in a 'believable' fashion, I guess, would be to rapidly deplete the atmosphere's CO2 and other greenhouse gases. This would lead to the Earth being unable to hold heat meaning at first a slow cooling but it would begin to accelerate quite quickly with the oceans freezing and more reflection of the sun's heat. Maybe Earth's scientists came up with a 'cure' for global warming by removing greenhouse gases in the atmosphere only for it to somehow go wildly out of control leading to the freezing of the planet. Depends on how you want to go about it I suppose.
You can only look up when you notice you've been looking down.