At 42:50- Charley refastens his belt buckle and at 43:49 refastens it yet again.
The IBM typewriters on the detective desks are IBM Selectric II models. The Selectric II was not introduced until 1971.
The Karns have multiple Verner Panton Globe lamps hanging. The series is set/begins in 1967 and that lamp was introduced in 69.
The Karns have multiple Verner Panton Globe lamps in their house. The story is set in 1967 and that lamp was introduced in 69.