Chen Chang, who plays Xiao Si'r (or Little Four) and Kuo-Chu Chang, who plays his father, are real-life father and son. The actor's own name is also used for the full name of the character of Xiao Si'r (or Little Four).
When Xiao Si'r's parents get really angry and quarrel with each other, they switch to speaking in Cantonese instead of their usual Mandarin.
Raised in the U.S., actor Lisa Yang (left), who plays Ming, spoke her Mandarin dialogue with such a heavy accent that the director had her lines redubbed by another actress.
The English title for the film comes from a line in Elvis Presley's song "Are You Lonesome Tonight?" Elvis sings the line, "Does your memory stray to a bright summer day," but the characters in the film mishear it as "a brighter summer day."
People in the film speak various dialects, as they or their parents came to Taiwan from different provinces of Mainland China. For example, Wang, a friend of Xiao Si'r's family, speaks Shanghainese.