Due to mixed reactions from test screenings, the film was in post-production for almost 3 years.
Sunny Sandler, Adam Sandler's daughter, is the girl asking if he's the loneliest man in the world.
Czechoslovakia/Czech Republic already had an astronaut/cosmonaut. It was Vladimir Remek, who flew into space on board Soyuz 28 in 1978. He was the first non-Soviet and non-American astronaut.
Based on the 2017 book Spaceman of Bohemia by Jaroslav Kalfar
Carey Mulligan was 8 months pregnant in real life in early to mid 2023 when she filmed supplemental scenes for Spaceman with Lena Olin as her mother.
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