"Some comedies didn't perform as expected and there were some great movies that didn't resonate here, although they did better internationally," Dergarabedian said by phone Sunday. "All it takes are one or two movies to harm the bottom line in a profound way."
The domestic box office is down about 6 percent year to date compared with a year earlier, according to ComScore.
The holdover picture "The Hitman's Bodyguard" from Lions Gate Entertainment Corp. led the box office for a third time, generating $13.4 million ($18.4 million NZ) through Monday, according to ComScore. It was forecast to generate $7.1 million ($9.7m NZ) from Friday to Sunday and $9.1 million ($12.5m NZ) through the extended holiday weekend, according to analysts at Box Office Mojo.
The biggest film opening this weekend was a re-release of Steven Spielberg's "Close Encounters of the Third Kind," which opened in 901 theaters to celebrate the science fiction film's 40th anniversary, according to ComScore.
The film was expected to take in $2.3 million ($3.1m NZ) for Friday through Monday.
The weekend also saw the debut of "Tulip Fever," a period drama from Weinstein Co. featuring Alicia Vikander, and the novel release of the first two episodes of Marvel Entertainment.'s "The Inhumans" on Imax screens. It had been planned as a film but was instead made into a TV show. ABC will premiere the series in the fall.
Among other returning films, Warner Bros.' "Annabelle: Creation" returned to place second with $9.3 million ($12.8m NZ) . It had been forecast to generate $5.1 million ($7m NZ) over three days and $6.7 million ($9.2m NZ) over four days, according to Box Office Mojo.
That puts it on track to be one of the few sequels this summer to beat its predecessor, according to Gitesh Pandya at Box Office Guru.
While sales were harmed by the lack of a new opening movie this weekend, Dergarabedian is expecting an improvement in the coming months, kicked off by Warner Bros.' release of "It," a horror thriller based on the Stephen King novel of the same name.
"The good news is we have 'It' this week, and then movies such as 'The Lego Ninjago Movie,' 'Kingsman: The Golden Circle' and 'Blade Runner 2049' to come," he said. "We are going to make up a lot of ground in the next three months."