When casing the Nik Stalinovich's complex, Luke Brunner (Arnold Schwarzenegger) identifies a guard's weapon as an "HK 416-series," a German weapon manufactured by Heckler & Koch, when in reality the weapon shown is a PK-series belt-fed light machine gun manufactured by Kalashnikov in Russia.
Emma carried her own personal phone on an operation. They would have issued them untraceable phones so they could not be compromised if their personal information were revealed.
The gang discuss in detail why Emma can't knock out Nik because this would then mean he he had been robbed but then two minutes later she destroys his safe to get to the papers inside thereby leaving indisputable evidence of a break-in.
Part of the plot involves the team reducing the power to a Faraday cage but Faraday cages to not use any power. They are entirely passive.
At 36:50 Luke Brunner says the guard is carrying an "HK 416 series" weapon. The HK416 is a 5.56x45mm assault rifle. The rifle shown carried by the guard looks like either a PKP or PKM Russian 7.62x54mm Maxine gun. Neither weapon looks anywhere similar.