After being dominated before the break, the late equaliser was reward for a much-improved second-half display by the home side.
In earlier matches, European-chasing Getafe were held to a 0-0 by a Racing Santander side who played almost the entire second half with 10 men after Jose Moratan was dismissed for two bookings.
The cup, which is competed for annually by fan-owned clubs, was secured with goals either side of half time by Andy Brown and Alex Meechan.
Further indiscipline by the Llanelli side in first-half injury time allowed Howarth to reduce the Glasgow deficit to 12-8 with his first penalty of the match.
Tries from Jamie Heaslip and Keith Gleeson helped the home side into a 18-3 lead by half-time.
Full-back Schifcofske went past a couple of tackles to touch down, then Cahill went over on the left wing to ensure the home side were greeted by a standing ovation at half-time.
Steenson responded with a second penalty shortly afterwards, reducing the home side's advantage to only 10 points by half-time.
Hook was one of the main culprits in his side's defeat by Saracens, but the fly-half produced a masterclass at Twickenham.
But with Defoe around, Spurs were always a threat too and the England striker came close either side of extra-time half-time - once thwarted by young defender David Raven and then seeing his shot whistle past the upright.
BBC: SPORT | Football | League Cup | Tottenham 1-1 Liverpool
Lock Bakkies Botha was banned for nine weeks for headbutting New Zealand half-back Jimmy Cowan in South Africa's opening match 32-12 loss, while Jean de Villiers was banned for two weeks for a dangerous tackle on Rene Ranger in the first half of his side's 31-17 defeat by New Zealand on 17 July.
Shane Sutherland gave Terry Butcher's Caley Thistle side the lead at half-time before second-half efforts by Richie Foran and Alex MacDonald sealed a deserved win for Inverness.
But either side of that - and the opportunities for Paul Robinson and Schofield either side of half-time - the game was generally well controlled by the hosts.
Midway through the second half Caerphilly were punished for off-side and Mitchell took advantage by sending over a penalty to give Vale a slender, one-point lead.
At the other end Doyle saw a header clawed off the line by Schwarzer and Sylvan Ebanks-Blake rifled into the side-netting in a richly entertaining second half.
However, any notion that the Reds are in a false position was for the most part dispelled, especially in the first half, by a joyful Blackpool side that blended a work-rate and commitment with some slick passing to celebrate a first win at Anfield since 1967.
And White said Fiji's inspired second-half burst should not mask a professional display by his own side.
The League Two side sensed a shock courtesy of a half-time lead given to them by Jack Compton's six-yard finish.
This was demonstrated when they conceded a penalty at the scrum which Flood kicked over from just inside his own half, and they compounded it by being caught off-side at the restart.
Tom Wood's charge-down of a clearance by Hougaard was the only try chance for either side in the first half.
The home side dominated the first half and led by the inspired Danny Cipriani, went 22-0 ahead with tries from Eoin Reddan, Tom Voyce and Paul Sackey.
More chances followed either side of half-time as Huddlestone's long-range effort was pushed away by Vaniak before the midfielder smashed a shot against the angle after ghosting past Ladislav Volesak.
Following a hapless first-half display the Hammers looked far from likely winners, but it was three second-half substitutions by boss Avram Grant which swung the match back in his side's favour.
With open looks hard to come by on each side of the court, the Hoosiers and Badgers turned to the 3-pointer in the first half to try to make some room for their big men inside.
Whittaker's second-half opener was added to by Kenny Miller's strike as the Ibrox side moved 13 points clear at the top of the Scottish Premier League.
It was a deserved win for the French side whose superiority was built upon the sophisticated edge given to their attack by the half-back pairing of Bosc and Adam Mogg.
In the end Andrei Iniesta's second-half goal -- inevitably set up by Messi -- gave the home side a comfortable buffer and left Pep Guardiola's team on course to defend their title.
Katlego Mphela, who was denied giving his side a win against Mexico by a post late on - missed the target with a close range header in each half.
Hampton had earlier lost goalkeeper Matt Lovett to a first-half injury and, with no keeper on the bench, centre-half Dean Wells took over in goal, but was seldom troubled by the home side.
Two goals in three second-half minutes by Wesley Sneijder and Arjen Robben helped to see off a resolute Uruguay side and put the Netherlands into a World Cup final for the first time since 1978.
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