There were just a few surprises in Lookingglass Theatre’s production of “20,000 Leagues Under the Seas” which will be running through Aug. 19.It is the Jules Verne classic (adapted by David Kersnar and Althos Low) set following the Civil War which has the Navy searching for a giant sea monster.That turns out to be a huge submarine, the Nautilus, operated by the self-declared renegade Captain Nemo, in a dynamic performance by Kareem Bandealy, under the direction of Kersnar.Verne is the fabulous author of …