The Naseys uploaded the 2nd part of their Dubai vlog. They (re)confirmed that they were working with Kayak, who followed them around various attractions to film them.
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I'm 99% certain that the Kayak crew out with the Naseys were also the mystery ones spotted filming the Inghams in their vlog.
For example:
See this beardy guy with tattoos on both upper arms...
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I'm pretty sure that this is him as well...different day but same tattoo placement...
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And this guy filming the Naseys...
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...appears to be this guy in the sushi place where the Inghams ate (with beardy tattoo man!)...
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The images are probably not too clear but hopefully you can see.
Oh and remember that new museum that Lazy & Creepy really wanted to visit but it was all sold out? Well the Naseys got a private, after hours tour one evening, just for them.
I wonder why the Minghams didn't wangle that!