Motherwell's John Ruddy had earlier saved a Riordan lob and a delightful curling shot from John Rankin.
Watson then made a bid for glory with a 20-yard punt that rebounded off John Ruddy's right-hand upright.
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Scunthorpe had the better of a low-key first half, Jonathan Forte forcing a fine stop from keeper John Ruddy.
Motherwell keeper John Ruddy deflected a Samaras shot off the bar after the Greece international struck from close range.
Fellow director John Ruddy said the club had interviewed 30 candidates, and dismissed speculation it had approached St Johnstone's Derek McInnes.
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But Boro levelled in the 21st minute when Julio Arca's pass deflected off City defender Leon Barnett past wrong-footed keeper John Ruddy.
The visitors opened the scoring when Flynn fired a low strike past John Ruddy in the Motherwell goal after good work from Moutinho.
The first coming from a Steven Gerrard layoff in the 24th minute, the second drilled low past Norwich goalkeeper John Ruddy four minutes later.
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Referee Euan Norris awarded an indirect free-kick inside the Motherwell penalty area after goalkeeper John Ruddy had picked up what was adjudged to be a pass-back from Stephen Craigan.
There were reports that John Ruddy had suffered a groin injury in the warm-up, but the Motherwell goalkeeper started the game and his fitness was rarely tested in the first half.
Graham wasted a great chance in injury time when he hooked a shot wide, and then goalkeeper John Ruddy came to Norwich's rescue to tip over Steven Caulker's bullet header in a breathless finish.
However, it was Rangers who continued to be the more threatening and Miller forced John Ruddy into a fine save with a low drive and Lafferty sliced wide when found in the clear 12 yards out.
North End, who are still waiting for their first win under manager Phil Brown, might have snatched a late winner themselves but Canaries keeper John Ruddy brilliantly denied denied Sean St Ledger from point-blank range with 13 minutes remaining.
Kilmarnock, who had brought in Iain Flannigan and Tim Clancy for injured pair Jamie Hamill and Simon Ford, emerged as an attacking force in the 26th minute when John Ruddy pushed wide Craig Bryson's 25-yard volley and then touched over Kevin Kyle's back-post header from Flannigan's corner.
Buoyed by that stop, Ruddy then saved a clever chip from Riordan as John Hughes' side continued to dominate possession.
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