A miscommunication between state and national staff members caused Mr. Gingrich to miss a meeting on Wednesday with Brian Sandoval, the popular Republican governor of Nevada, which infuriated the local staff who had set it up.

On Wednesday evening, as the news media, including The New York Times, published a report that Donald Trump would endorse Mr. Gingrich, citing sources in or close to the campaign — a report that later proved false — Mr. Gingrich’s spokesman ignored requests to confirm or deny the account. And on Thursday, a forum with Hispanic leaders scheduled for 10 a.m. was suddenly pushed back 30 minutes, frustrating the local Gingrich supporter who had arranged it…

To encourage voter turnout, campaign volunteers are calling about 10,000 people identified as Gingrich supporters in response to automated calls. But the volunteers had to vacate a conference room in the Element hotel here on Thursday because it was booked by another group. They moved upstairs to a guest room…

But the canceled meeting with Mr. Sandoval, which Mr. Gingrich’s state team said was the result of a mix-up by his national staff, was a sorely missed opportunity. Mr. Sandoval endorsed Gov. Rick Perry of Texas before Mr. Perry dropped out, throwing his support to Mr. Gingrich. The state team was hoping for a Sandoval endorsement.