Before Jordin lets Solo out of the wine vat, he tells Solo to take off his jacket and shoulder holster and to remove one shoe. But Solo's pants pockets are also turned out, despite Jordin neither asking him to do it nor Solo being shown turning them out.
Solo discovers the dead Gritsky, now a boy. You can clearly see the young actor breathing.
Gritsky uses the age reducing machine to turn into a young boy, with a mustache, which would be impossible for child who hasn't gone through puberty.
In England cars have right hand drive and drive on the left side of the street, but there were cars with left hand drive parking and driving on the right side of the street.
The title card for Act II says, "Thrush Flaps It's Wings." It should be, "Thrush Flaps Its Wings."