[2][3] The Royal Dutch Football Association (KNVB) suspended all players that left the country to play professionally abroad, including Van der Hart.

[4] In 2003, Van der Hart told Dutch public broadcaster NOS that players such as himself and Bram Appel, Theo Timmermans, Bertus de Harder and Kees Rijvers had heard of the flood over the radio and realised their country was in a state of panic.

[2] One of the most memorable international matches Van der Hart was a part of was a 2–1 away win against world champions West Germany in 1956.

In 1999 Van der Hart wore the orange shirt one more time, when he was selected to the so-called "Oranje of the Century team".

Ajax played with black arm bands in Van der Hart's memory in their 2006–07 UEFA Cup tie against Zulte Waregem.

[6] Van der Hart's grandson Mickey is a goalkeeper who attended the Ajax youth academy and plays for Polish Ekstraklasa side Lech Poznań.