Very unusual situation: Tatra KT4 from route 1 was transferred to route 6 in the morning. A few hours later it returned to route 1. Normally trams in Zagreb don't change their routes throughout the day.

Also, Tatra KT4 trams are a rare sight on route 6 (as they are inadequate, too small for one of the busiest routes), and routes 1 and 6 are operated by different depots, which meant that a tram from Trešnjevka depot appeared on route operated by Dubrava.

Same thing happened again with car 346 next day.

During the morning of shooting, a derailment had occured which caused a service disruption, howewer this was unrelated because routes 1 and 6 were not affected.