At Eureka the black box is shown in front of plane. Black boxes are installed in the tail section of airplanes,
Opening scene of S4E1 has a caption says "Shanghai Province, China" Shanghai is a city, not a province.
at 37:17, Sanvi goes to console Cal couched in a darkened room, she says to him "No, No", but it is wrongly attributed to [Grace] (Cal's deceased mother) in the original English subtitles.