At the siege of Boulogne, a figure appears accompanying Henry, and wearing a sallet (helmet) from the 1470's. Even if out-of-fashion armor may have been used, it is extremely unlikely that someone close to the king would have worn equipment some 70 years out of date.
Henry arrives to Boulogne wearing an armor and chain-mail, also his horse and Brandon's are covered in this chain-mail which seems clearly fake. In any case chain-mail was out of use at that time; having been replaced by plate armor, also it is very unlikely that a horse would have been fully covered this way.
At the siege of Boulogne one or two English cannon are shown recoiling on firing, but others appear to have no recoil at all. Gunners are also shown serving a piece with gunpowder from a wide open container: this would have been unthinkable due to the danger from sparks.
Very briefly, when Henry is seen looking over his troops at Boulogne atop an overlook, a coat of arms is shown fixed to the outside wall of it. This coat of arms is meant to represent Henry VIII and the Tudor reign, but incorrectly shows the harp in the third quadrant. Though Henry was officially king of Ireland by this time, the Irish Harp was not officially taken into the royal arms until the reign of James I, also known as James VI of Scotland, after the Tudor era had finished. To be more accurate to Henry's arms there should be included the French fleur de lis upon a blue field in the first and fourth quadrants, but there is none. The coat of arms shown is closer to the arms used currently by Queen Elizabeth II; however even this would be inaccurate, as the lion in the second quadrant, shown as golden on a blue field, would have to be red on a golden field to be accurate to this. Further to this, a Unicorn (representing Scotland) can be seen as the left-hand supporter of the shield. The Unicorn was incorporated into the arms by King James VI of Scotland in 1603 when he became King James I of England and Scotland.