When Mac and Frank/Larrabee (the guy suffering from an attack of acrophobia) are having trouble at the wire bridge, the river below is very turbulent and has a waterfall, yet when Pete and the lady ranger reach the bridge sometime later and find the cables down, the waterway beneath it is a nearly-stagnant brook with just a faint gentle current, with no whitewater visible. Obviously an entirely different location, with just a couple of cables draped over the bank to simulate the bridge in the previous scenes.
Escaped convict Mark Fulton (posing as Henry Colter, and wearing Colter's fishing-lure-decorated blue denim hat) uses a stolen prison-guard's revolver to shoot Colter inside the park restroom, and then he later murders Dr. Fred Beam in the tent when Beam tries to retrieve his own concealed handgun from his backpack. So Fulton would have had two revolvers with him during his hike through the woods with Ranger Liz, not just the one he stole from the guard.
Mark Fulton has brown hair and his cut-off ponytail is shown to be dark brown. yet the actor who follows Colter into the restroom has a light-blonde ponytail.
This episode is supposed to be set in the spring or fall, since there is green grass, ferns, etc. growing in the area, yet in many of the beginning shots of Mac driving his jeep to the trail-head's parking area, there is heavy snow along the road.
Inconsistent weather throughout. From sunny, to overcast, foggy, to wet/raining to dry ground all within the short time frame of the scenes.
The holly berries are still firm and bright red after Mac pours them out on the ground. Most kinds of berries would likely be darkened and softened after being boiled enough to release their chemicals into a pot of coffee.
A "junkyard bus" was used as the overturned prison bus, as seen by the severely rusted roof, sides, and undercarriage, along with the other signs of visible wear.
When the pepper-sprayed Frank falls backward and breaks through the fire tower's railing, the edges of the "broken" 2x4 rails are all flat and neatly square, and the "breaks" are all in the same vertical line, showing they are pre-cut beams.
When the prisoner (the camera view was what the man would have seen) walks up to the car in the beginning of the episode, the video camera is visible in the reflection of the car window.
Some of the members of the hiking party are nervously discussing how they might tell which might be the escaped convict among them yet MacGyver does not think of the obvious solution of simply checking the members' P.F. ID card photos against the faces of their bearers. (The reason he does not do so, however, is that this would have ended much of the storyline and likely provoked an immediate shooting by Fulton of the two innocent hikers, and, probably, MacGyver.)
Mac may not have liked guns, but the lady forest ranger was obviously fairly comfortable with them, since she handled the rifle so well. So she would have taken the first villain's pistol with her after she and Mac captured him, and thus she would have had the handgun to defend herself and Mac with when the two convicts tried to overpower them at the fire tower.
Mac states that the holly-berry-laced coffee would have killed anyone who drank the brew, yet Fulton later correctly tells Frank, who accuses Fulton of almost killing him with the poisoned coffee, that the holly-berries are not usually fatal to adults, and they "would just have put [Frank and the others] to sleep for awhile". As an experienced camper/survivalist, MacGyver should have known this, as well.
When Mac removes the trapdoor from the floor of the fire tower, Liz makes a surprised motion with her hands as if to say, "Oh, you're not going to just leave the door flipped open and use the pulley-lift as we would normally do?" Mac would have needed to first unscrew the door's hinges to be able to remove the door as he does here, and Liz was right there in the tower with Mac and thus would have seen him do this, so Liz would not have been surprised to see Mac remove the door, since she would have known from seeing Mac remove the hinges that this was obviously what he was planning to do.
Incredibly, when they find out about the escaped convict, MacGyver doesn't think (nor does Park Ranger Liz, who would have had the authority) to call off the camping trip. After someone had been killed, the Phoenix Foundation or the Park Service would have been liable for damages.