Nope --- NASA, for example, made some hefty changes in 1986.
They even made changes in 1967 --- it took a real scientist (and three dead men) to figure out that a door should open inward --- not outward.
Are you referring to the Apollo 1 training accident on Jan 27, 1967? This was not actually caused by the door opening inward (you have it backwards, as usual). It was because they were using a pure oxygen atmosphere under high pressure. It is likely that an electical spark started a fire which killed the crew in seconds due to the high pressure oxygen environment. The critisism concerning the door was that under high internal pressure, it was probably impossible to open the hatch from the inside since it opened inward.
As usual, you over-simplify everything. There were a number of safety concerns with the old Apollo 1 capsule design. After the accident, the following steps and design changes were implimented:
At launch the cabin atmosphere would be at sea-level pressure and consist of 60% oxygen and 40% nitrogen, lowering to 5 psi during ascent and gradually changing over to 100% oxygen at about 2 psi during the first 24 hours of the trans-lunar coast.
The hatch would open outward (which had already been planned) and be openable in less than ten seconds.
Flammable materials in the cabin were replaced with self-extinguishing versions.
Plumbing and wiring were covered with protective insulation.
1,407 wiring problems were corrected.
Nylon suits were replaced with suits made of early Beta cloth, a non-flammable, highly melt-resistant fabric woven from silica and coated with glass.
An explosive hatch was re-added (which had been removed after Mercury 4 when the hatch blew prematurely on Grissom's capsule and caused it to sink, irking NASA officials). The redesigned hatched used a cartridge of pressurised nitrogen to drive the release mechanism in an emergency, as opposed to the pyrotechnic bolts used on Mercury.
(wikipedia)