When Josh meets Alan Krim in the bathroom, Krim accepts Josh's request of having Drake on TRL and Krim told Josh to have Drake at Sunset Studio in Hollywood at 4 o'clock. Later on, when locked up in the warehouse, Drake and Josh wake up at 2 in the morning, and Drake said that he had to be at Sunset Studio in 15 hours, which then would be 5 o'clock instead of 4 o'clock.
When Drake and Josh take Megan to the airport, they are seen leading her onto the plane in the terminal. However, they wouldn't be able to get past security if they didn't have tickets for the flight, which they have to buy later on after they are in the terminal.
When Drake and Josh are in the San Diego airport after Meagan departs, a television news program brakes to an on-the-scene report. The reporter says he is standing in front of The Treasury Building, yet is clearly standing in front of The Capitol Building.
The pilot's voice is the same on both flights. Both of them were in the air while they were flying to their destination. It's also the voice of a lot of radio shows and TV news reports. The reporter that Josh is looking at on the TV at the airport appears to have also the same voice.