Iniesta will have calmed his coach's nerves, though as he gave Barca a dream start with the hosts' first attack of the contest.
"Nothing sounds better for a younger Barca supporter than a comic hero who wears the shirt of his team and lives so many adventures, " says filmmaker Uri Garcia, who is hoping to produce a documentary about Castel.
For the first time in a long time Barca will have a tall striker who can make an impact in the air, as well as create his own chances in the area and bring others into play.
Barca is a possession based team, with great passers, change of offensive direction, high and midfield pressure.
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Lucescu's half-time teamtalk must have focused on damage limitation, but against a Barca team committed to wave after wave of attack and with a monopoly on possession it was an almost impossible task.
The closest you get to a Barca villain is midfield enforcer Sergio Busquets or wingback Dani Alves, both of whom have a penchant for taking a tumble to win a free kick, while Busquets is known for the odd dirty tackle.
Quaresma had a spell with Barcelona earlier in his career, but Hull also had a former Barca player in their ranks in Geovanni and the Brazilian fired a sublime half-volley inches wide of Henrique Hilario's goal, with Chelsea's stand-in keeper stranded.
The second half was a different story, with the skills and pace of halftime substitutes Saviola and Riquelme, and later Overmars, helping Barca step up a gear.
However, Inter will argue they deserved their slice of luck, and the match-up of Mourinho against Bayern boss Louis van Gaal, one of the men under whom he served his apprenticeship at Barca, provides a fascinating back-drop to what will be an hotly-contested final next month.
But he could not agree a deal with Barca and returned to Juventus last summer, before moving to Inter on a free transfer.
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Barca advanced courtesy of a stunning comeback win over Italy's AC Milan.
The Swede joined Barca in 2004 following a hugely successful seven-year spell at Celtic, where he is widely hailed as one of the best players in the club's history.
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Despite the views of one of its favorite sons, the football club is less forthright in extolling the virtues of independence, reflecting that not all Barca fans are against a unified Spain.
Ibrahimovic, who will wear the number nine shirt, has made little secret of his desire to join the Catalan club and told Barca TV on Wednesday a deal with Inter president Massimo Moratti was key to the move.
But in the waning moments of the first half, Frank Lampard sent a through ball to Ramires, who chipped it over Barca goalkeeper Victor Valdes from 12 yards for a crucial away goal that would have served as a tiebreaker.
Tello added a fifth for Barca when he slotted home in the final 10 minutes after Messi had been denied by Cesar.
Barca might have won by a greater margin had it not been for Zaragoza goalkeeper Toni Doblas, who made a string of brilliant saves.
Barca could also have snatched a victory, but David Villa missed a golden opportunity to mark his 100th first-team appearance after coming on as a substitute.
Cesc Fabregas claimed a penalty as Barca looked to level the tie but the referee waved away his appeals before Andres Iniesta cut in from the right and fired wide of the target.
"The club has written to UEFA due to a series of incidents on the pitch in the understanding that objectively speaking it was evident that the referee did not apply the rules of the game, " Barca spokesman Toni Freixa told a news conference Thursday.
Shakhtar were allowed one flicker of hope when Iniesta picked up a booking for encroachment that rules him out of the second leg and, when the free-kick was eventually taken, Rakitskiy beat a batch of Barca players to the ball and sent it past Valdes.
The 25-year-old recently signed a new contract with Barca which will keep him in Catalunya until June 2018.
He also inked a contract extension with Barca last month that will keep him in Spain through 2018.
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Barca's success was also a personal triumph for rookie boss Guardiola, who insisted that he should not appear in the movie.
But Barca, which has not lost a domestic game this season, hit back through Lionel Messi and Carles Puyol to lead 2-1 at the interval.
But Barca continued to look threatening and a wonderful flowing move ended with Cesc Fabregas threading the ball through for Andres Iniesta to stroke home.
David Villa, Andres Iniesta and Sergio Busquets started on the bench as La Liga leaders Barca beat Real Zaragoza thanks to a Seydou Keita strike.
The key to Barca's current success is a philosophy of play which emerged as a direct descendant of Holland's Total Football of the 70's, and is implemented throughout the club's teams - from seven-year-olds right up to the first team.
This was a classic match-up of Inter's defence against Barca's attack, though Mourinho's side did have a brief glimpse of goal when Samuel Eto'o found himself in space in the box from Wesley Sneider's cross, only for his touch to allow Pedro to get back and clear.
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