When the Harold Lloyd character places the baby on the sofa, the baby is seen rolling forward onto its stomach. In the next shot, the baby is back on its back, it which would not yet have the core strength to roll onto its back at that age.
Lloyd and Davis are reading the newspaper and a closeup of the headline about the burglaries is shown. But, in the next medium shot, Lloyd turns the newspaper over and the headline is larger and different - "GERMANY INVADED!" it says.