Normal service was resumed for leaders St Helens, who took their frustration out on Huddersfield after a stunning loss to the Broncos.
Harlequins have welcomed former rugby league star Sean Long as an assistant coach for next season.
St Helens were stunned by London Broncos, while Tony Smith's first match in charge of Hull KR ended in late disappointment.
Seven tries from seven different players saw St Helens beat Castleford Tigers and restore their six-point lead at the top of Super League.
Salford Red Devils produced a fine comeback at St Helens, but there was another twist in the tale as the Super League leaders prevailed.
St Helens were made to fight hard by lowly Hull KR, with Kevin Naiqama and Tommy Makinson hat-tricks sealing a 42-26 Super League win.
St Helens and Warrington Wolves both scored 50 points in respective wins over Catalans Dragons and Huddersfield Giants on Sunday.
Super League leaders St Helens scored 11 tries in a brutal thrashing off Hull FC, whose city rivals were also giving a hammering.
Regan Grace scored a hat-trick of tries as St Helens moved four points clear in Super League thanks to victory over rivals Wigan Warriors.
A wonderful night for St Helens saw them thrash fellow Super League front-runners Warrington Wolves as Wigan lost at Wakefield.